The ius gentium or jus gentium (Latin for "law of nations") is a concept of international law within the ancient Roman legal system and Western law traditions based on or influenced by it. The ius gentium is not a body of statute law nor a legal code,[1] but rather customary law thought to be held in common by all gentes ("peoples" or "nations") in "reasoned compliance with standards of international conduct".[2]

Following the Christianization of the Roman Empire, canon law also contributed to the European ius gentium.[3] By the 16th century, the shared concept of the ius gentium disintegrated as individual European nations developed distinct bodies of law, the authority of the Pope declined, and colonialism created subject nations outside the West.[4]

Roman law

In classical antiquity, the ius gentium was regarded as an aspect of natural law (ius naturale), as distinguished from civil law (ius civile).[5] The jurist Gaius defined the ius gentium as what "natural reason has established among all peoples":[6]

Every people (populus) that is governed by statutes and customs (leges et mores) observes partly its own peculiar law and partly the common law of all mankind. That law which a people established for itself is peculiar to it and is called ius civile (civil law) as being the special law of that civitas (state), while the law that natural reason establishes among all mankind is followed by all peoples alike, and is called ius gentium (law of nations, or law of the world) as being the law observed by all mankind. Thus the Roman people observes partly its own peculiar law and partly the common law of all mankind.

— Gaius, G. Inst. 1.1[7]

As a form of natural law, the ius gentium was regarded as "innate in every human being", a view that was consonant with Stoic philosophy.[8] Cicero[9] distinguished between things that are written and those that are unwritten but upheld by the ius gentium or the mos maiorum, "ancestral custom".[10] In his treatise De officiis, he regards the ius gentium as a higher law of moral obligation binding human beings beyond the requirements of civil law.[11] A person driven into exile, for instance, lost his legal standing as a Roman citizen, but was supposed to retain the basic protections extended to all human beings under the ius gentium.[12]

The 2nd-century Roman jurist Ulpian, however, divided law into three branches: natural law, which existed in nature and governed animals as well as humans; the law of nations, which was distinctively human; and, civil law, which was the body of laws specific to a people.[13] Slavery, for instance, was supported by the ius gentium, even though under natural law all are born free (liberi).[14] In this tripartite division of law, property rights might be considered a part of the ius gentium, but not of natural law.[15] Hermogenianus, a Roman jurist of the second half of the 3rd century, described the ius gentium as comprising wars, national interests, kingship and sovereignty, rights of ownership, property boundaries, settlements, and commerce, "including contracts of buying and selling and letting and hiring, except for certain contractual elements distinguished through ius civile".[16] The ius gentium was thus in practice important in facilitating commercial law.[17]

War, peace and the gentes

The theory and terminology of private law was far more developed among the Romans than that of international law.[18] The earliest form of international law was religious and pertained to the concept of the "just war" (bellum iustum), which should only be undertaken with a ritualized declaration of war by the fetial priests.[19] Foreign ambassadors were protected by the ius gentium, and it was a religious violation to harm an envoy.[20]

While the terms of peace treaties might be said to fall broadly within the ius gentium, there was no framework of international law per se with which a treaty had to conform. As gentes were brought under Roman rule, Roman law became in effect international law.[21] Local laws remained in force as long as they did not come into conflict with Roman law; this compatibility was understood as reflecting the underlying ius gentium.[22] The praetor assigned to foreign affairs (praetor peregrinus) is thought by many scholars to have played an important role in extending Roman civil law to the gentes.[23] Laws originally pertaining to matters of contract law among Roman citizens, such as property transfers and manumission, were thus "internationalized" among the gentes.[24] Questions of "international law" might arise in relation to individual grants of citizenship, and whether these accorded with treaty.[25] Because there was no generally accepted principle of international law, controversy might also arise over whether "Rome was bound by an agreement concluded by a field commander without approval of the Senate—typically an armistice concluded in distress and on unfavourable terms."[26]

A key passage pertaining to what Romans understood as "international law" is presented by Livy, as spoken by an envoy of King Antiochus:[27]

There were three kinds of treaties (foedera, singular foedus), he said, by which states and kings concluded friendships (amicitiae): one, when in time of war terms (leges) were imposed upon the conquered; for when everything was surrendered to him who was the more powerful in arms, it is the victor's right and privilege to decide what of the conquered's property he wishes to confiscate; the second, when states that are equally matched in war conclude peace and friendship on terms of equality; under these conditions demands for restitution are made and granted by mutual agreement, and if the ownership of any property has been rendered uncertain by the war, these questions are settled according to the rules of traditional law or the convenience of each party; the third exists when states that have never been at war come together to pledge mutual friendship in a treaty of alliance; neither party gives or accepts conditions; for that happens when a conquering and a conquered party meet.[28]

Terminology

Terminology associated with Roman international law was non-specialized but included:[29]

  • amicitia, "a relation of friendship without any further concrete engagements, i.e. the mere exclusion of hostilities; … it could be concluded by a treaty but also without".[30]
  • societas, although sometimes a mere synonym for amicitia, is "an obligation to peace and neutrality" with "a duty to grant military support".[31]
  • foedus, originally a sacred oath made by a fetial priest on behalf of the Roman people, who will suffer a "self-damnation" if they violate the treaty.[32]
  • pax, "both the state of peace and the means to achieve it by treaty".[33]
  • indutiae, "cease-fires" that "do not end the war as a whole, but interrupt the hostilities only temporarily".[34]
  • deditio, surrender, with "the inherent normative expectation that the victor would in any case spare the inhabitants' lives".[35]
    • dediticius, a person who became a subject of the Roman Empire through a deditio; dediticii were excluded from the universal citizenship extended to all free inhabitants of the empire under the Constitutio Antoniniana.[36]
  • fides, "trustworthiness, loyalty, credibility", was a quality the Romans wanted to pride themselves for upholding, including respect for the law and fides in foreign relations.[37]

Medieval Europe

In the Middle Ages, the ius gentium derived from canon law in addition to Roman legal theory.[38] In late antiquity, Isidore of Seville (c. 560–636), enumerated the principles of the ius gentium, focusing on foedera pacis, "peace treaties":[39]

Ius gentium is occupation, construction, fortification, wars, captivity, the right of regaining citizenship after captivity, slavery, treaties, peace, armistice, the inviolability of ambassadors, the prohibition of mixed marriages; and it is the ius gentium because nearly every nation uses it.[40]

References

  1. ↑ R.W. Dyson, Natural Law and Political Realism in the History of Political Thought (Peter Lang, 2005), vol. 1, p. 127.
  2. ↑ David J. Bederman, International Law in Antiquity (Cambridge University Press, 2004), p. 85.
  3. ↑ Randall Lesaffer, introduction to Peace Treaties and International Law in European History from the Late Middle Ages to World War One (Cambridge University Press, 2004), pp. 5, 13.
  4. ↑ Randall Lesaffer, "Peace Treaties from Lodi to Westphalia", in Peace Treaties and International Law in European History, p. 34.
  5. ↑ Brian Tierney, The Idea of Natural Rights (Wm. B. Eerdmans, 2002, originally published 1997 by Scholars Press for Emory University), pp. 66–67; Dyson, Natural Law and Political Realism, p. 236.
  6. ↑ Quod vero naturalis ratio inter omnes homines constituit … vocator ius gentium, Digest 1.1.9; Tierney, The Idea of Natural Rights, p. 136.
  7. ↑ Quoted in Laurens Winkel, "The Peace Treaties of Westphalia as an Instance of the Reception of Roman Law", in Peace Treaties and International Law in European History, p. 225.
  8. ↑ Winkel, "The Peace Treaties of Westphalia", p. 225; Marcia L. Colish, The Stoic Tradition from Antiquity to the Early Middle Ages (Brill, 1980), p. 360 et passim.
  9. ↑ Cicero, Partitiones oratoriae 37.130.
  10. ↑ A. Arthur Schiller, Roman Law: Mechanisms of Development (Mouton, 1978), pp. 254–255.
  11. ↑ Cicero, De officiis 3.17.69; Colish, The Stoic Tradition, p. 150.
  12. ↑ Clifford Ando, Law, Language, and Empire in the Roman Tradition (University of Pennsylvania Press, 2011), p. 29.
  13. ↑ Digest 1.1.1.4; Tierney, The Idea of Natural Rights, p. 136.
  14. ↑ Digest 1.1.4; Tierney, The Idea of Natural Rights, p. 136.
  15. ↑ Digest 1.1.5; Tierney, The Idea of Natural Rights, pp. 136–137.
  16. ↑ Digest 1.1.5; Winkel, "The Peace Treaties of Westphalia", pp. 225–226.
  17. ↑ Adda B. Bozeman, Politics and Culture in International History from the Ancient Near East to the Opening of the Modern Age (Transaction Publishers, 2010, 2nd ed., originally published 1960 by Princeton University Press), p. 210.
  18. ↑ Christian Baldus, "Vestigia pacis. The Roman Peace Treaty: Structure or Event?" in Peace Treaties and International Law in European History, pp. 112–113.
  19. ↑ David J. Bederman, International Law in Antiquity (Cambridge University Press, 2004), pp. 231–239 et passim.
  20. ↑ Sextus Pomponius (2nd century AD), in his commentary on the ius civile of Q. Mucius Scaevola: "If someone strikes an ambassador of the enemy (legatus hostium), he is regarded as having acted against the law of nations (ius gentium), because ambassadors are regarded as sacred (sanctus"); Daniel Peretz, "The Roman Interpreter and His Diplomatic and Military Roles", Historia 55.4 (2006), p. 454; Bederman, International Law in Antiquity, pp. 104–105, 114–115.
  21. ↑ After the Battle of Pydna in 168 BC, no Western power was equal to that of Rome. Persia was thereafter the only other major power with which Rome was in regular contact. Baldus, Vestigia pacis, pp. 111–112; Olivier Hekster, Rome and Its Empire, AD 193–284 (Edinburgh University Press, 2008), p. 47.
  22. ↑ Bozeman, Politics and Culture in International History, pp. 208–209.
  23. ↑ T. Corey Brennan, The Praetorship in the Roman Republic (Oxford University Press, 2000), p. 134; Dyson, Natural Law and Political Realism, p. 127; Bozeman, Politics and Culture in International History, p. 208.
  24. ↑ Schiller, Roman Law, p. 529; Bozeman, Politics and Culture in International History, pp. 206–208.
  25. ↑ Baldus, Vestigia pacis, pp. 135–136.
  26. ↑ Baldus, Vestigia pacis, p. 132.
  27. ↑ Baldus, Vestigia pacis, pp. 114–115.
  28. ↑ Livy, 34.57.7–9.
  29. ↑ Baldus, Vestigia pacis, p. 113.
  30. ↑ Baldus, Vestigia pacis, p. 120.
  31. ↑ Baldus, Vestigia pacis, p. 120.
  32. ↑ Baldus, Vestigia pacis, pp. 120–121.
  33. ↑ Baldus, Vestigia pacis, p. 122.
  34. ↑ Baldus, Vestigia pacis, p. 122.
  35. ↑ Baldus, Vestigia pacis, p. 122.
  36. ↑ Hekster, Rome and Its Empire, p. 47.
  37. ↑ Baldus, Vestigia pacis, p. 140.
  38. ↑ Lesaffer, introduction to Peace Treaties and International Law in European History, p. 5.
  39. ↑ Karl-Heinz Ziegler, "The Influence of Medieval Roman Law on Peace Treaties," in Peace Treaties and International Law in European History, p. 147.
  40. ↑ Isidore, Etymologies 5.6 (ius gentium est sedium occupatio, aedificatio, munitio, bella, captivitates, servitutes, postliminia, foedera pacis, indutiae, legatorum non violandorum religio, conubia inter alienigenas prohibita. Et inde ius gentium, quia eo iure omnes fere gentes utuntur); Winkel, "The Peace Treaties of Westphalia," p. 226.

Further reading

  • Relectiones, Franciscus de Victoria (lect. 1532, first pub. 1557). Available online here.
  • The Law of War and Peace, Hugo Grotius (1625). Available online here.
  • The Law of Nature and of Nations, Samuel Pufendorf (1674, tr. Basil Kennett 1703). Available online here, under construction.
  • Questions of Public Law, Cornelius van Bynkershoek (1737). Available online here.
  • The Law of Nations, Emmerich de Vattel (1758). Available online here.
  • Tucker's Blackstone, St. George Tucker (1803). Available online here.
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