House of Pomerania (Griffins)

The Pomeranian Griffin

The Stolp (Słupsk) and Schlawe (Sławno) areas (lands of (Länder) Schlawe-Stolp) were ruled by Ratibor I and his descendants (Ratiboriden branch of the Griffin House of Pomerania) until the Danish occupation and extinction of the Ratiboride branch in 1227.

The areas stretching from Kolberg (Kołobrzeg) to Stettin (Szczecin) were ruled by Ratibor's brother Wartislaw I and his descendants (House of Pomerania, also called Griffins, of which he was the first ascertained ancestor) until the 1630s.^[1] The terms of surrender after the Polish conquest were that Wartislaw had to accept Polish sovereignty, convert his people to Christianity, and pay an annual tribute to the Polish duke.

Poland

Poland with Pomerania during the rule of Bolesław III Wrymouth

In several expeditions mounted between 1102 and 1121, most of Pomerania had been conquered by the Polish duke Bolesław III Wrymouth.^[2]

From 1102 to 1109, Boleslaw campaigned in the Noteć and Parsęta area.^[3] The Pomeranian residence in Białogard was taken already in 1102.^[2] From 1112 to 1116, Boleslaw subdued all of Pomerelia.^[3] From 1119 to 1122, the area towards the Oder were subdued.^[3] Szczecin was taken in the winter of 1121–1122.^[3]

The conquest resulted in a high death toll and devastation of vast areas of Pomerania, and the Pomeranian dukes were forced to become vassals of Boleslaw III, King of Poland.^[4][5][6]

Poland's influence vanished in the next decade.^[7] In 1135, Bolesław had accepted overlordship of Holy Roman Emperor Lothair III and in turn received his Pomeranian gains as well as the still undefeated Principality of Rügen as a fief.^[8][9] Wartislaw I also accepted the Emperor as his overlord.^[9] With Bolesław's death in 1138 and the fragmentation of Poland, Polish overlordship ended,^[10] triggering competition of the Holy Roman Empire and Denmark for the area.^[9]

Westward expansion of Wartislaw I

In the meantime, Wartislaw managed to conquer vast territories west of the Oder river, an area inhabited by Lutici tribes weakened by past warfare, and included these territories into his Duchy of Pomerania. Already in 1120, he had expanded west into the areas near the Oder Lagoon and Peene river. Most notably Demmin, the Principality of Gützkow and Wolgast were conquered in the following years.^[7]

The major stage of the westward expansion into Lutici territory occurred between Otto of Bamberg's two missions, 1124 and 1128. In 1128, Demmin, the County of Gützkow and Wolgast were already incorporated into Wartislaw I's realm, yet warfare was still going on.^[11] Captured Lutici and other war loot, including livestock, money, and clothes were apportioned among the victorious.^[12] After Wartislaw's Lutician conquests, his duchy lay between the Bay of Greifswald to the north, Circipania, including Güstrow (Ostrów), to the west, Kolobrzeg in the east, and possibly as far as the Havel and Spree rivers in the south.^[13]

These gains were not subject to Polish over lordship,^[9][14] but were placed under over lordship of Nordmark margrave Albrecht the Bear a dedicated enemy of Slavs,^[15] by Lothair III, Holy Roman Emperor.^[9] Thus, the western territories contributed to making Wartislaw significantly independent from the Polish dukes.^[16] Wartislaw was not the only one campaigning in these areas. The Polish Duke Boleslaw III, during his Pomeranian campaign launched an expedition into the Müritz area in 1120–21,^[17] before he turned back to subdue Wartislaw. The later Holy Roman Emperor Lothair III (then Saxon duke Lothair I of Supplinburg) in 1114 initiated massive campaigns against the local Lutici tribes resulting in their final defeat in 1228.^[17] Also, the territories were invaded by Danish forces multiple times, who, coming from the Baltic Sea, used the rivers Peene and Uecker to advance to a line Demmin–Pasewalk.^[14] At different times, Pomeranians, Saxons and Danes were either allies or opponents.^[14] The Pomeranian dukes consolidated their power in the course of the 12th century, yet the preceding warfare had left these territories completely devastated.^[8]

Conversion and the Pomeranian diocese

Kammin diocese

A first attempt to convert the Pomeranians was made following the subjugation of Pomerania by Boleslaw III of Poland. In 1122, Spanish monk Bernard (also Bernhard) travelled to Jumne (Wolin), accompanied only by his chaplain and an interpreter. The Pomeranians however were not impressed by his missionary efforts and finally threw him out of town.^[5][18]

Bernard was later made the first bishop of Lubusz in Poland.^[5]

After Bernard's misfortune, Boleslaw III asked Otto of Bamberg^[19] to convert Pomerania to Christianity, which he accomplished in his first visit in 1124–25.^[20] Otto's strategy severely differed from the one Bernard used: While Bernard travelled alone and as a poor and unknown priest, Otto, a wealthy and famous man, was accompanied by 20 clergy of his own diocese, numerous servants, 60 warriors supplied to him by Boleslaw, and carried with him numerous supplies and gifts. After arriving in Pyritz, the Pomeranians were assured that Otto's aim was not the gain of wealth at the expense of the Pomeranian people, as he was wealthy already, but only to convert them to Christianity, which would protect the Pomeranians from further punishment by God, as which the devastating Polish conquest was depicted. This approach turned out to be successful, and was backed by parts of the Pomeranian nobility that in part was Christian raised already, like duke Wartislaw I, who encouraged and promoted Otto's mission. Many Pomeranians were baptized already in Pyritz and also in the other burghs visited.^{[5][21][22][23]}

St. Nicholas, Wolin

Otto of Bamberg returned in 1128,^[22] this time invited by duke Wartislaw I himself, aided by the emperor Holy Roman Emperor Lothar II, to convert the (Lutician) Slavs of Western Pomerania just incorporated into the Pomeranian duchy, and to strengthen the Christian faith of the inhabitants of Stettin and Wollin, who fell back into heathen practices and idolatry.^[23] Otto this time visited primarily Western Pomeranian burghs, had the temples of Gützkow and Wolgast torn down and on their sites erected the predecessors of today's St Nikolai and St Petri churches, respectively. The nobility assembled to a congress in Usedom, where they accepted Christianity on June 10, 1128.^[20][23][24] Otto then was titled apostolus gentis Pomeranorum, made a saint by pope Clement III in 1189, and was worshipped in Pomerania even after the Protestant Reformation.^[25]

Cathedral, Kamien Pomorski

In 1140, one year after Otto of Bamberg's death, a Pomeranian diocese was founded and placed directly under the Holy See.^[26][27] Adalbert of Pomerania, who had participated in Otto's mission as an interpreter and assistant, was made the first bishop.^[26][28] The direct subordination under the pope thwarted the claims of the archbishops of Magdeburg and Gniezno, who both had asserted pressure on Otto of Bamberg to incorporate the new diocese into their realms.^[26] The initial see of the Pomeranian diocese was Wollin, and was moved to Grobe Abbey on the island of Usedom and to Kammin (Cammin, now Kamien Pomorski) after 1150 and 1175, respectively.^[29] Since 1188, when the pope accepted the move of the see, the bishopric was referred to as Roman Catholic Diocese of Kammin, while before it was addressed as Pomeranian diocese.^[30]

In 1248, the Kammin bishops and the Pomeranian dukes had interchanged the terrae Stargard and Kolberg, leaving the bishops in charge of the latter.^[31] In the following, the bishops extended their secular reign, which soon comprised the Kolberg (now Kołobrzeg), Köslin (also Cöslin, now Koszalin) and Bublitz (now Bobolice) areas.^[32] When in 1276 they became the sovereign of the town of Kolberg also, they moved their residence there, while the administration of the diocese was done from nearby Köslin.^[31] The bishops at multiple occasions tried to exclude their secular reign from ducal overlordship by applying for Imperial immediacy (Reichsunmittelbarkeit).^[32] The Pomeranian dukes successfully forestalled these ambitions,^[32] and immediacy was granted only temporarily in 1345.^[31]

Denmark and the Holy Roman Empire

Northern countries during the 13th and early 14th centuries

---

  Norway

  Sweden 1330s–1350s

  Denmark

  Conquered by Denmark in 1219

  Livonia before 1343

In the West, bishops and dukes of the Holy Roman Empire mounted expeditions to Pomerania. Most notable for the further fate of Pomerania are the 1147 Wendish Crusade and the 1164 Battle of Verchen, the Pomeranian dukes became vassals of Henry the Lion, of Saxony. Despite this vassalage, Henry again sieged Demmin in 1177 when he allied with the Danes, but reconciled with the Pomeranian dukes thereafter.^[33] In 1181 the dukes took their duchy as a fief from the Holy Roman Emperor Barbarossa.^[34][35][36] Bogislaw I, Duke of Pomerania had travelled to Barbarossa's camp in Lübeck, where he received the Imperial flag and the title "Duke of Slavinia".^[36]

From the North, Denmark attacked Pomerania. Several campaigns throughout the 12th century (in 1136, 1150, 1159 and throughout the 1160s) culminated in the defeat of the Principality of Rugia in 1168.^[37] The Rugian princes became vassals of Valdemar I of Denmark. In the fall of 1170, the Danes raided the Oder estituary. In 1171, the Danes raided Circipania and took Cotimar's burgh in Behren-Lübchin. In 1173, the Danes turned to the Oder Lagoon again, taking the burgh of Stettin. Wartislaw II Swantiboriz, castellan of Stettin, became a Danish vassal. In 1177, the Danes again raided the Oder Lagoon area, also the burgh of Wolgast in 1178. In 1184 and 1185, three campaigns of the Danes resulted in making Bogislaw I, Duke of Pomerania a Danish vassal.^[35] These campaigns were mounted by Valdemar's son and successor for the Danish throne, Canute VI of Denmark. In the Duchy of Pomerania the Danish period lasted until Valdemar II of Denmark lost the Battle of Børnehoved on 22 July 1227.^[35] Danish supremacy prevailed until 1325^[37] in the Rugian principality.^[38]

At that time, the duchy was also referred to as Slavinia (German: Slawien), a term also applied to several Wendish areas such as Mecklenburg and the Principality of Rügen.^[39]

Rural settlement

Before the Ostsiedlung, Pomerania was rather sparsely settled. Around 1200, a relatively dense population could be found on the islands of Rügen, Usedom and Wollin, around the burghs of Stettin, Köslin, Pyritz (Pyritzer Weizacker) and Stargard, around the Persante river (Kolberg area), the lower Peene river, and between Schlawe and the Leba valley. Largely unsettled were the hilly regions and the woods in the South. The 12th century warfare, especially the Danish raids, depopulated many areas of Pomerania and caused severe population drops in others (e.g. Usedom). At the turn to the 13th century, only isolated German settlements existed, e.g. Hohenkrug and other German villages, and the merchant's settlement near the Stettin burgh. In contrast, the monasteries were almost exclusively run by Germans and Danes.^[40]

Massive German settlement started in the first half of the 13th century. Ostsiedlung was a common process at this time in all Central Europe and was largely run by the nobles and monasteries to increase their income. Also, the settlers were expected to finish and secure the conversion of the non-nobles to Christianity. In addition, the Danes withdrew from most of Pomerania in 1227, leaving the duchy vulnerable to their expansive neighbors, especially Mecklenburg, Brandenburg, and Henry I of Silesia.^[41]

Germans, at this early stage (before 1240), were often settled in frontier regions, such as the mainland part of the Principality of Rugia (after prince Jaromar I granted Eldena Abbey the right to call in settlers in 1209), Circipania, the lands of Loitz (administered semi-independently by Detlev of Gadebush), the Uckermark, the lands of Kolbatz Abbey and Bahn (which later was granted to the Knights Templar), and the area north of the Warthe and along the lower Oder river. However, in many of these frontiers, German settlement did not hinder the advance of Pomerania's neighbors.^[41]

Germans were placed under a different law than Slavs. While those were unfree (except for the nobles), did not own the soil they cultivated, and were to serve the nobility, the opposite was true for the Germans.^[42][43]

About 1240, the areas of Stavenhagen and Pyritz were subject to German settlement. About 1250, massive settlement took place also in Central Western Pomerania (County of Gützkow, lands of Meseritz, Ploth, Ziethen and Groswin), and the Stargard area (where settlement was encouraged already since 1229). In the 1260s, settlement started in the Cammin area, and in the virtually unpopulated lands of Naugard, Massow and Daber. The Ueckermünde and the Oder mouth areas were also settled at about 1260, but the Ueckermünde heath and the woodlands on both sides of the Oder Lagoon remained untouched. In the areas adjacted to the Peenestrom (the lands of Wusterhusen and Lassan) local Slavs participated in the German settlement, which started in the 1260s. Settlement of the areas centered on the upper Rega river, previously unsettled, started in the 1250s, and reached a peak in the 1280s. The lower Rega area around Greifenberg and Treptow an der Rega was settled about the same period, but here a native Slavic population participated. In the Persante area, first German settlements occurred about 1260, but a more extensive settlement did not start before 1280. On the islands of Usedom and Wollin, only isolated settlements took place in the 13th century, e.g. in the Garz (Usedom) and Caseburg (Karsibór) area, where Germans settled already in the 1240s, and in proximity of the German town of Wolin. The local Grobe Abbey did, in contrast to the other Pomeranian monasteries, not enhance German settlement. Therefore, Slavic culture on the isles persisted and vanished only in the late 14th century. The island of Rügen, in contrast to the meanwhile German mainland parts of the principality, also remained a Slavic character throughout the 13th century – German settlement would only start in the 14th century, with strong participation of local Slavs. In Schlawe-Stolp, German settlement started in the 1260s, and was promoted by the Belbuck Abbey. A large influx of settlers to the western parts of Schlawe-Stolp took place after 1270, first settlers were called to the Stolp area in the 1280s. Here, local Slavs participated in the Ostsiedlung, and settlement went on throughout the 14th century.^[44]

Initially, the Germans who settled the northern regions predominantly came from Lower Saxony, while the Germans who settled the southern areas (mittelpommerscher Keil) predominantly came from Altmark and Westphalia. This caused the emergence of East Pomeranian, Central Pomeranian and Mecklenburgisch-Vorpommersch dialects. German settlers also came from areas earlier affected from Ostsiedlung, such as Mecklenburg, Brandenburg, and later also German settled regions of Pomerania herself. Though the exact proportion of German versus Slavic populations cannot be determined, it is undisputed that the Germans significantly outnumbered the Slavs. Before the end of the 13th century, the Western Pomeranian mainland and most of Farther Pomerania west of the Gollenberg had turned almost completely German, mentions of Slavs in documents became exceptional. The Slavic dialects disappeared, with the exception that fishermen from the isles and the Oder lagoon area continued to use Wendish for a relatively long period.^[45]

Villages before the Ostsiedlung were of the Haufendorf type, the houses were built in close proximity to each other without a special ruling. A variant of this type also found in Pomerania is the Sackgassendorf (or Sackdorf) type, where a dead end road leads to those houses. This type evolved as an extension of Haufendorf type villages. German settlement introduced new types of villages: In the Hagenhufendorf type, houses were built on both sides of a main road, each within their own hide (German: Hagen). Those villages were usually set up after the clearance of woodlands, most of them were given German names in absence of any Slavic site names. This type of village can be found all along the coast, most of them in the areas between Barth and Wolgast, Kolberg and Köslin, and north and west of Schlawe. Other villages were built in the Angerdorf type, where a main street fork encloses a large meadow ("Anger") in the village's center where the life stock was kept at night, sometimes the church or other buildings not used for living were built on the Anger also. This type is the most prominent type in the Peene, lower Oder, Pyritz, Lake Madü and Rega areas, many villages of this type are also found in the Kolberg and Schlawe area. In addition to these types, the Straßendorf type, characterized by a single and very long main street, was introduced in a later stage of Ostsiedlung, and therefore is found predominantly in areas that were affected last by the German settlement (easternmost parts, Cammin area). Villages of this type were either new foundations, or extensions of Slavic precursors. In other areas, Hagenhufendorf and Angerdorf types dominate, while the Haufendorf type used in Slavic times and its Sackdorf variant can still be found in between, predominantly on the islands.^[46][47]

The villages' area was divided in hides. The size of a hide differed between the village types: A Hagenhufe, used in the Hagenhufendorf villages, comprised 60 Morgen (Latin: iugera), about 40 hectares. A Landhufe, used in the Angerdorf villages, comprised 30 Morgen. One farm would usually have an area of one Hagenhufe or two Landhufen. Slavic farmland was measured in Haken (Latin: uncus), with one Haken equals 15 Morgen (half a Landhufe). Haken were used only in villages remaining under old Slavic law (predominantly on the islands), whereas Hufen were used for new villages placed under German law (in Pomerania sometimes referred to as Schwerin Law). Not all families of German villages owned a Hufe. Those dwelling on considerably smaller property ("gardens") were usually hired as workers by the farmers (German: Vollbauern). These people were termed "gardeners" (German: Gärtner) or Kossäten (literally "who sits in a hut"), and could either be local Slavs or the younger sons of German farmers who did not inherit their father's soil.^[47][48]

Foundation of towns

Nearly all towns in modern Pomerania date back to the Ostsiedlung. In Slavic times, there have been town-like settlements already in Demmin, Wolgast, Usedom, Wollin, Stettin, Kolberg, Pyritz and Stargard, although many of the coastal settlements declined during the 12th century warfare.^[49] Yet these settlements were not continued by the German towns, which were founded on previously unsettled soil. Although some towns had a Slavic settlement, sometimes attached to a burgh, as precursor, the name of which would be adopted for the German town, the new town was usually founded on empty space in the settlements neighborhood.^[50] The distance could be some kilometers as in the case of Kolberg. Exceptions are Wollin and probably Cammin, which were built on the spot of former, yet decayed settlements, and Stettin, where two German settlements were set up close to the Slavic burgh and settlement, all of which were included in the later town. In many cases, the name of the neighboring Slavic settlement would be used for the new town.^[51]

Medieval Greifswald, a typical Ostsiedlung town. Locators set up rectangular blocs in an area resembling an oval with a central market, and organized the settlement.

The towns were built on behalf of the Pomeranian dukes or ecclesial bodies like monasteries and orders.^[23] Most prominent on this issue was Barnim I of Pomerania-Stettin, who since was entitled "the towns' founder". The towns build on his behalf were granted Magdeburg Law and settled predominantly by people from the western Margraviate of Brandenburg, while the towns founded in the North (most on behalf of the Rugian princes and Wartislaw III of Pomerania-Demmin were granted Lübeck Law and were settled predominantly by people from Lower Saxony. The first towns were Stralsund (Principality of Rügen, 1234), Prenzlau (Uckermark, then Pomerania-Stettin, 1234), Bahn (Knights Templar, about 1234), and Stettin (1237–43), Gartz (Oder) (Pomerania-Stettin, 1240), and Loitz (by Detlev of Gadebusch, 1242). Other towns built in the 1240s were Demmin, Greifswald (by Eldena Abbey), Altentreptow.^[52]

In the 1250s followed Anklam, Altdamm, Pyritz, probably already Stargard and Grimmen, Greifenhagen, Barth (Principality of Rügen, before 1255), and Damgarten (Principality of Rügen, 1258). In the 1260s followed Wollin (1260), Ueckermünde, Wolgast, probably already Gützkow, Pölitz (1260), Greifenberg (1262), Gollnow, probably already Usedom, Penkun, Tribsees (Principality of Rügen, before 1267) and Naugard (by the bishop of Cammin, before 1268). In the 1270s followed Cammin (1274), Massow (by the bishop of Cammin, 1274), Pasewalk (recorded in 1274, founded probably in the 1250s), Plathe (1277), Lassan (between 1264 and 1278), Rügenwalde (by Wizlaw II of Rügen), Regenwalde (1279–80), Labes (about 1280), and Treptow an der Rega (between 1277 and 1281). Neuwarp, Richtenberg, Belgard, and Werben (by the bishop of Cammin) are first recorded in 1295, 1297, 1299, and 1300, respectively, all were most certainly founded earlier.^[52]

In the area directly administered by the bishops of Cammin, the towns of Kolberg (1255), Köslin (1266), Körlin (early 14th century), and Bublitz (1340) were set up. The early 14th century saw the foundation of Stolp (by Waldemar of Brandenburg, 1310), Neustettin (by Wartislaw IV, 1310), Rügenwalde (again 1312, the 1270s precursor had not done well), Rugendal (Principality of Rügen, before 1313, decayed), Schlawe (by the Swenzones, 1317), Garz (by the princes of Rügen, 1320s), Jacobshagen (by three brothers von Stegelitz, 1336), Freienwalde (by von Wedel, before 1338), Zanow (by the Swenzones, 1343), Lauenburg (by the Teutonic Knights, 1341), Bütow (by the Teutonic Knights, 1346), and Fiddichow (by Barnim III, 1347).^[52]

Many towns with a burgh in close proximity had the duke level this burgh when they grew in power. Stettin, where the burgh was inside the town, had the duke level his burgh already in 1249,^[50] other towns were to follow. The fortified new towns had succeeded the burghs as strongholds for the country's defense. In many cases, the former burgh settlement would become a Slavic suburb of the German town ("Wiek", "Wieck"). In Stettin, two "Wiek" suburbs were set up anew outside the walls, to which most Slavs from within the walls were resettled. Such Wiek settlements did initially not belong to the town, but to the duke, although they were likely to come into possession of the town in the course of the 14th century. Also in the 14th century, Slavic Wiek suburbs lost their Slavic character.^[53]

Indigenous Slavs and Poles faced discrimination from the arriving Germans, who on a local level since the 16th century imposed discriminatory regulations, such as bans on buying goods from Slavs/Poles or prohibiting them from becoming members of craft guilds.^[54]

Hanseatic towns

The towns of Pomerania that had joined the Hanseatic League acted independently from the duchy, and sometimes opposed the dukes' interest.^[55] The most powerful towns were Stralsund, Greifswald, and Stettin, but also Demmin, Anklam and Kolberg. Before the Treaty of Stralsund in 1370, and during the reign of Eric of Pomerania, the Hanseatic towns were in a state of war with Denmark for hegemony in the Baltic Sea.^[56]

Parts of the Pomeranian nobility were engaged in piracy against Hanseatic vessels. Barnim VI of Pomerania-Wolgast did not only engage in piracy himself, he is also known for providing refuge and hideouts for the Likedeeler pirate organisation.^[57]

The relation between the towns and the nobility throughout the Middle Ages ranged from alliances and support (German: Landfrieden) to cabalism, banditry and outright warfare.^[55][58]

War with Brandenburg

During the reign of Otto I, Margrave of Brandenburg and son of Albert I of Brandenburg (1100–1170), Brandenburg claimed sovereignty over Pomerania. Yet, in 1181, Holy Roman Emperor Frederick I invested Duke Bogislaw I of the Griffin House of Pomerania with the Duchy of Slavia (Pomerania). This was not accepted by the Margraviate of Brandenburg and triggered several military conflicts.

Between 1185 and 1227, Pomerania along with most of the southern Baltic coast remained under sovereignty of Denmark. However, Brandenburg again tried to gain sovereignty over Pomerania, and in 1214 for a short time conquered Stettin.^[62] After Denmark lost the Battle of Bornhoeved in 1227, Denmark lost all her territories on the southern Baltic shore, including Pomerania.^[36]

At this time, the Duchy of Pomerania was co-ruled by duke Wartislaw III of Demmin and duke Barnim I of Stettin. After the Danes retreated, Brandenburg took her chance and invaded Pomerania-Demmin. In 1231, Holy Roman Emperor Frederick II gave the duchy, which then was again a part of the empire, as a fief to the Ascanian margraves of Brandenburg.^[63][64]

Denmark also attempted to restore her rule and took Wolgast and Demmin in 1235, but was driven out the same year.^[65] Wartislaw had to accept Brandenburg's overlordship in the 1236 Treaty of Kremmen, furthermore he had to hand over most of his duchy to Brandenburg immediately, that was the Burg Stargard Land and adjacted areas (all soon to become a part of Mecklenburg, forming the bulk of the later Mecklenburg-Strelitz area). Circipania was already lost to Mecklenburg in the years before.

In the 1250 Treaty of Landin between Pomeranian dukes and margraves of Brandenburg, Barnim I managed to reassert the rule of his Griffin house over Pomerania, but lost the Uckermark to Brandenburg.

Brandenburg since 1250 expanded eastward. In 1250–52, the margraves gained half of Lebus Land, including the terra Küstrin between Warthe and Mietzel (Myśla), and the terra Chinz north of the Mietzel river, both previously held by Barnim. In the course of the 1250s, the margraves further gained the castellanies Zantoch and Driesen except for the burghs itself, of both castellanies actually belonging to Greater Poland, Barnim had held the northern parts. In 1261, Barnim lost the Soldin area, and in the following years the terra Zehden to Brandenburg.^[66]

In 1264, Duke Wartislaw III of Demmin died, his cousin Barnim I (the Good) became the sole ruler of the duchy. In 1266, Barnim I married Mechthild, the daughter of Otto III, Margrave of Brandenburg.

In 1269, Barnim lost the terra Arnswalde to the margraves. Before his death, he bought the western part back in 1278.^[67]

Bogislaw IV lost the Bernstein area and Zinnenburg Land (terra Arnhausen and terra Schivelbein), in 1280. All former Pomeranian territories east of the Oder lost to Brandenburg in the 13th century became parts of the Brandenburgian Neumark ("new march").^[67]

War with Silesia

In 1234 and 1241, Silesian dukes Henry I and Henry II expanded their realm to the North, and even took control of areas north of the Warthe (Warta) river previously held by the Dukes of Pomerania.^[68] The Griffin dukes, Silesian Piasts, Dukes of Greater Poland, the bishops of Lebus and the bishops of Kammin all competed for the Warthe/Netze (Notec) area, centered around the burgh of Zantoch. Until 1250, Barnim I, Duke of Pomerania had recovered most of the previous Pomeranian territory^[68] and sought to secure them with the settlement of Germans, while Zantoch burgh was held by Przemysł II of Greater Poland.^[66]

Competition for Schlawe-Stolp

The last member of the Ratiborides branch of the Griffins, Ratibor II, died in 1223.^[69] This led to a competition between the Griffins and the Pomerelian Samborides for inheritance of Schlawe-Stolp.^[69] Because Ratibor died during the Danish period, Denmark administered the area until she had to withdraw after the lost Battle of Bornhöved in 1227.^[69] Barnim I, Duke of Pomerania, took control of the lands immediately after the Danish withdrawal, but had to yield Pomerelian duke Swantopolk's rights, whose relationship to the Ratiborides was closer.^[69] Swantopolk took over Schlawe-Stolp in 1235–36.^[69] The Griffins mounted an unsuccessful campaigns to gain the area in 1236–38,^[70] 1253,^[69][70] 1259,^[69][70] and 1266.^[70] After the death of Swantopolk II in 1266, Barnim I took over the area and kept it until 1269, when Rugian prince Wizlaw II took over.^[69] He withdrew in 1277 and left the area to Brandenburg.^[69] In 1283, Mestwin II of Pomerelia took over.^[69] Competition arose anew after his death in 1294.^[69] In 1296, Wizlaw's son Sambor launched another campaign.^[70]

Gain of Schlawe-Stolp (1317–47)

In 1316–17, the Griffin duke of Pomerania-Wolgast took over these areas as a fief from Waldemar of Brandenburg. In 1347, the area became fully attached to Pomerania-Wolgast.^[79] The lands of Stolp were pawned to the Teutonic Order from 1329 to 1341, the Bütow area was bought by the Knights in 1329 and thus remained outside Pomerania-Wolgast.^[80]

Gain of the Principality of Rügen (1325–1356)

The Rugian Prince Wizlaw III died in 1325. Because of the earlier death of his son, he had no male heir, and Wartislaw IV of Pomerania-Wolgast took over the principality according to the 1315 agreement with Christopher II of Denmark. Yet, in the meantime Christopher's throne had been challenged by Valdemar III of Denmark, and Christopher had granted Rugia to Mecklenburg for her aid against his opponent. After Wartislaw died in 1326, Mecklenburg invaded the principality, triggering the First War for Rugian Succession (German: Erster Rügenscher Erbfolgekrieg). Wartislaw's minor sons were aided by primarily by Greifswald and Demmin, but also by Stralsund, Anklam, and Valdemar III, who decisively defeated the Mecklenburgian army in 1228 near Völschow. In the subsequent Treaty of Brudersdorf, Mecklenburg withdrew her claims for 31,000 mark in silver. In exchange, the terrae Tribsees, Grimmen and Barth were pawned to her. When the Pomeranian dukes in 1340 were not able to bail out these lands, but refused to formally hand them over, the Second War for Rugian Succession (German: Zweiter Rügenscher Erbfolgekrieg). This time, the dukes of Pomerania-Wolgast were aided by those of Pomerania-Stettin and the Counts of Gützkow. After the Pomeranian forces defeated the Mecklenburgians in the Battle of Schopendamm near Loitz in 1351, they were able to take Grimmen and Barth in 1354 and Tribsees in 1356. Mecklenburg dropped her claims thereafter. Another party in these wars for Rugian succession was the bishop of Schwerin, who sought to enforce his claims by legal means, but was not successful in his appeals to various ecclesial courts.^[81]

Further partition of Pomerania-Wolgast (1376–1425): Pomerania-Wolgast and Pomerania-Barth

The western remainder of Pomerania-Wolgast was further partitioned between Bogislaw IV and Wartislaw VI on December 6, 1376. Wartislaw VI received Pomerania-(Wolgast)-Barth, the former principality of Rügen, and Bogislaw IV's Pomerania-Wolgast was reduced to an area between Greifswald and the Swine river. When Bogislaw VI died in 1393 and Wartislaw VI in 1394, the latter's sons Barnim VI and Wartislaw VIII ruled in common.^[82][83][84]

On December 6, 1425, the western part of Pomerania-Wolgast (without Pomerania-Stolp) was partitioned again at a congress in Eldena Abbey, this time among the Wartislaw IX and his brother Barnim VII, who received the eastern part with Wolgast, and their cousins Swantibor II and his brother Barnim VIII, who received the Rugian part with Barth.^[85]

In 1456, the University of Greifswald was founded on behalf of Greifswald's burgomaster Heinrich Rubenow, becoming the first university of Pomerania and one of the oldest in northern Europe.^[86]

Pomerania-Stolp

Słupsk castle

Eric of Pomerania crowned king of the Kalmar Union

The situation of the descendants of Bogislaw V, who ruled Pomerania-Stolp, differed somewhat from the situation of their western counterparts. The area was more sparsely settled and dominated by powerful noble families, so not much income could be derived by the dukes. On the other hand, the Stolpian branch of the House of Pomerania had relatives among the royal houses of Denmark and Poland. Casimir IV and Elisabeth, the children of Bogislaw V and his first wife Elisabeth, the daughter of Casimir III of Poland, where both raised at the Polish court in Kraków. Elisabeth would become Holy Roman Empress after her marriage with Charles IV, and Casimir was adopted by and designated heir of his grandfather. Yet, his ambitions were swarted when Ludwig of Hungary overruled the testament of Casimir of Poland in 1370, Casimir of Pomerania-Stolp only for a short time took the land of Dobrin as a fief. Eric II of Pomerania-Stolp, grand-grandchild of Danish king Valdemar IV in contrast became king of the Kalmar Union in 1397.^[87]

Eric however failed in his most ambitious plan, to make Bogislaw IX of Pomerania-Stolp king of both the Kalmar Union and the Polish–Lithuanian Commonwealth. Eric had to leave Denmark in 1449 and ruled Pomerania-Rügenwalde, a small partition of Pomerania-Stolp, until his death in 1459.^[88]

Pomerania-Stolp was a crucial point in the Knights' land supply route. Bogislaw VIII of Pomerania-Stolp allied with both the Teutonic Knights and Poland, but supported the latter after the war had started in 1409 by blocking his lands for the Knights' troops and allowing his nobles to kidnap those who were travelling his lands. For his aid, he was granted the Lauenburg (now Lębork) and Bütow (now Bytów) areas (Lauenburg and Bütow Land) and others, but those were lost in the First Peace of Thorn in 1411.^[89]

Pomerania-Stettin

Pomeranian Dukes' Castle, Szczecin

Casimir V of Pomerania-Stettin at the same time allied with the Teutonic Knights and took part in the Battle of Grunwald, where he was caught by the Poles and bailed out by the Knights after the First Peace of Thorn.^[90]

The main concern of the Stettin dukes however was Brandenburg, namely the Neumark and Uckermark regions. Casimir III died in 1372 during a siege of Königsberg (Neumark), after he had managed to receive an Imperial approval of his Uckermark possessions in 1370. On May 17, 1373, all dukes of Pomerania concluded an alliance in Kaseburg, but situation eased when Otto VII, Margrave-elector of Brandenburg abdicated on August 15, 1373, and the House of Luxembourg took over the march on October 2 of the same year. In 1374, the Luxembourgians allied with all branches of the House of Pomerania. Pomeranian dukes even held positions in the march's administration.^[91]

When Brandenburg changed hands from the House of Luxembourg to the House of Hohenzollern on January 11, 1411, the dukes of Pomerania-Stettin understood their position endangered and reacted with warfare. The first major battle was the second Battle of Kremmer Damm on October 24, 1412. While the dukes of Pomerania-Wolgast had sided with the emperor, disappointment over the emperors disapproval of ridding them of formal Brandenburgian overlordship in 1417 drove them to ally with their Stettin relatives and Mecklenburg. This coalition was backed by Denmark and Poland. A series of battles culminated in a decisive defeat on March 26, 1420, in the streets of Angermünde, and the Uckermark possessions were lost once again.^[92]

Polish–Teutonic Wars

In 1320 and 1325, Wartislaw IV of Pomerania-Wolgast allied with the Landmeister of the State of the Teutonic Order in Prussia against king Casimir III of Poland.^[93] When the Treaty of Kalisz had ended the subsequent Polish–Teutonic War (1326–32) in 1343, Wartislaw's sons Bogislaw V, Barnim IV and Wartislaw V changed sides, and Bogislaw V married Casimir III's daughter, Elisabeth.^[93] Barnim III of Pomerania-Stettin joined this alliance in 1348.^[93] After Poland and Lithuania had formed the Union of Krėva in 1385, and Poland had rejected the claims of Casimir III's grandson Casimir IV of Pomerania-Stolp, Bogislaw VIII and Wartislaw VII of Pomerania-Stolp in 1386 concluded an anti-Polish alliance with the Teutonic Knights, after they had settled their common border.^[93] In 1388, this alliance was joined by Swantibor I and Bogislaw VII of Pomerania-Stettin as well as Barnim VI and Wartislaw VI of Pomerania-Wolgast.^[93]

Later in 1388 however, the dukes of Pomerania-Stolp left this alliance and sided with Poland, who had promised to partially respect their claims as Casimir III's heirs.^[94] Thence, the nobles of Pomerania-Stolp robbed the Teutonic Knights and their supply routes, provoking a counter-attack that destroyed many noble strongholds and the fortifications of Köslin (now Koszalin).^[94] Bogislaw VIII, Barnim V and Wartislaw VII reacted by siding with Polish king Jogaila and concluding mutual trade alleviations.^[94]

When Wartislaw VII died, Bogislaw VIII and Barnim V concluded a treaty with the Teutonic Knights to safeguard their supply routes in turn for a financial credit.^[94] Swantibor I and Bogislaw VII of Pomerania-Stettin changed sides in 1395 and allied with the knights in turn for financial aid.^[94] Barnim V in 1397 concluded an alliance with Poland, married Vytautas' niece Hedwig and was in Jogaila's service in 1401 until he died in 1402 or 1404.^[94] Bogislaw VIII also entered into Jogaila's service, but changed sides in 1407–08, when he allied with the Teutonic Knights and settled their common border.^[94]

Nikolaus Bock, Cammin bishop from 1398–1410, had also sided with the knights before and placed his bishopric under their suzerainty.^[94] Wartislaw VIII of Pomerania-Wolgast allied with the knights in return for an assumption of a debt and additional payments.^[94] Swantibor I and Bogislaw VII of Pomerania-Stettin joined this alliance in 1409, after they had concluded a ten-year truce with the knights in return for debt cancellation before.^[94] When the knights lost the Battle of Tannenberg in 1410, Bogislaw VIII of Pomerania-Stolp changed sides again and allied with Poland^[94] in return for the Bütow, Schlochau, Preußisch-Friedland, Baldenburg, Hammerstein and Schivelbein areas, which Poland had gained from the State of the Teutonic Order before.^[95] This was however cancelled by the First Peace of Thorn in 1411.^[95]

While Bogislaw VIII nevertheless upheld his alliance with Jogaila, Konrad Bonow of the Cammin diocese in 1414 concluded an alliance with the Teutonic Knights against both Bogislaw VIII and Jogaila, which was turned into a truce soon after.^[95] In 1417, Bogislaw VIII and the Teutonic Knights settled their common border in the Hammerstein area, ending their conflicts.^[95] Bogislaw VIII's son Bogislaw IX together with all other Pomeranian dukes in 1423 allied with the Teutonic Knights.^[95]

War with Brandenburg and the Hanseatic League (1423–1448)

On September 15, 1423, all Pomeranian dukes (including Eric) allied with the Teutonic Knights against Brandenburg and against the Hanseatic towns. In early 1425, this coalition was joined by Mecklenburg and Poland and successfully invaded Brandenburg. A peace treaty concluded on May 22, 1427, in Eberswalde, left Pomerania with the Uckermark north of Angermünde. On June 16, 1427, this was confirmed by the Treaty of Templin, which also included a coalition of Pomerania, Brandenburg and Mecklenburg. Yet, in 1440 Pomerania and Brandenburg invaded Mecklenburg, and in 1444 Brandenburg demanded from Pomerania to again hand over the Uckermark to her. When the Pomeranians refused, war broke out again. The first Treaty of Prenzlau in 1448 set the border south of Pasewalk.^[97]