Abu’l Fath of Sarmin was a Nizari Ismaili missionary (da'i) and qadi from Sarmin, Syria. He enlisted help from Ridwan and fellow Assassin Abu Tahir al-Sa'igh to assassinate Khalaf ibn Mula’ib in 1106, after which he bcame emir of the Assassin castle Qalaat al-Madiq in Apamea. He also enlisted Ridwan to counter the threat from Tancred. Tancred, with help from Khalaf’s son Musbih ibn Mula’ib, captured the town. Abu’l Fath, without allies among the neighboring emirs, negotiated the safe passage of the Muslims in the town. Nevertheless, he and three of his followers were put to death. Apamean nobles were then taken to Antioch to be ransomed by Ridwan.

References

• Willey, Peter; Institute of Ismaili Studies (2005). Eagle's nest: Ismaili castles in Iran and Syria. I.B.Tauris. ISBN 978-1-85043-464-1.

• Runciman, Steven, A History of the Crusades, Volume Two: The Kingdom of Jerusalem and the Frankish East, 1100-1187, Cambridge University Press, London, 1952, pgs. 52-3

• Ibn al-Qalanisi, Gibb, H. A. R., The Damascus Chronicle of the Crusades: Extracted and Translated from the Chronicle of Ibn Al-Qalanisi (2nd ed.), Courier, 2002, pgs. 73-4