well as the number of knights owed to the crown by each of the kingdom's vassals. Marriage and children With Maria of Armenia (sister of Hethum I, King of Armenia and daughter of Constantine of Baberon), John had the following children: James (c. 1240– July 18, 1276), count of Jaffa and Ascalon 1266, married Marie of Montbéliard c. 1260 Philip (d. aft. 1263) Guy (c. 1250–February 14, 1304), titular count of Jaffa and Ascalon 1276, married his cousin Marie, Lady of Naumachia c. 1290 John (d. aft. 1263) Hethum Oshin Margaret (c. 1245– aft. 1317), Abbess of Notre Dame de Tyre, Nicosia Isabelle (c. 1250– aft. 1298), married Sempad of Servantikar c. 1270 Marie (d. aft. 1298), married firstly Vahran of Hamousse, secondly Gregorios Tardif October 10, 1298 Notes References See also Vassals of the Kingdom of Jerusalem 1215 births 1266 deaths Christians of the Sixth Crusade Christians of the Seventh Crusade Counts of Jaffa and Ascalon 13th-century jurists House of Ibelin