was put to death by the Sultan Baibars during the conquest of the city in 1268. The Greeks also continued to choose their patriarchs of Antioch, but these lived generally in Constantinople. The Byzantine Empire was greatly offended by this and tried to re-establish either a Greek patriarchate or a joint patriarchate. Though the Treaty of Devol in 1108 nominally restored a Greek patriarch, the treaty was never enforced. Under Manuel I Komnenos there was briefly a joint patriarchate when Antioch fell under Byzantine control, but for the most part there was only a Latin patriarch. The Byzantine Empire recognized this de facto control of the See of Antioch and the Latin Patriarch soon played a key role in solidifying ties between the Crusader states and the Byzantine Empire. This represented one of the sole instances of coordinated action by Byzantine and the Franks throughout the crusader period, and led to a number of joint political, diplomatic, military, and marriage alliances. The Latin Patriarch of Antioch was established to serve the Catholic members of the diocese and represent all Christians living in its territory and was one of the major ecclesiastical authorities in the Crusader states. Throughout the Crusader period both Greeks and Latins served under its hierarchy which included numerous suffragan bishops, abbots, cathedrals, monasteries, and churches under its ecclesiastical rule. In 1206, seeing that the Byzantine Empire was no longer a threat and wanting to gain the goodwill of his Greek subjects as he feared the Armenians of Cilicia, Prince Bohemond IV restored a Greek Patriarch to Antioch for a short period. The Mongols also favored a Greek Patriarch, but Latin Patriarchs held the see until the Crusaders had been ousted. In 1342, the Greek Patriarchate transferred his seat to Damascus which grew in prominence as the city of Antioch's Christian and overall population declined. Both Latin and Greek Patriarchs continued to be appointed by the Pope and the Byzantine Emperor respectively during the following centuries. However, the Latin Patriarch was a titular office, with its seat at the Basilica di Santa Maria Maggiore in Rome. It continued to play a role in helping to protect various isolated Christian communities in the Near East and eventually secured their unity with Rome. The last holder of this office was Roberto Vicentini, who held it until his death 1953. It remained vacant until the title was suppressed in January 1964,