Conrad III. In 1257, he confirmed a treaty with the city of Ancona, granting it commercial rights in Acre in return for aid of fifty men-at-arms for two years. Though Ancona was an ally of the Republic of Genoa and John sought by his treaty to bring the feudatories — most of whom were onside — to support Genoa against Venice in the War of Saint Sabas, his plan ultimately backfired and John of Jaffa and John II of Beirut engineered a coup to make Plaisance of Antioch, the estranged wife of John's son Balian, bailiff on behalf of the regent Hugh II of Cyprus. John accepted the coup and reconciled with Plaisance and Bohemond VI of Antioch. When Plaisance returned to Cyprus, he was again put in charge as lieutenant. In 1258, he negotiated the treaty between the military orders, the Hospitallers, Templars, and Teutonic Knights, which regulated their relationship. Upon his death that same year, he was succeeded as constable by his lieutenant, Geoffrey of Sergines, appointed by Plaisance. He had married Alice, daughter of Rohard of Haifa, at an unknown date prior to his death. His son and successor in Arsuf was Balian. References Christians of the Barons' Crusade Christians of the Seventh Crusade 1211 births 1258 deaths House of Ibelin People of the War of Saint Sabas