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The Latin Patriarch of Antioch was an office established in the aftermath of the First Crusade by Bohemund, the first Prince of Antioch. The city already had a Greek Patriarch, who was expelled and fled to Constantinople. The Byzantine Empire was greatly offended by this and worked towards re-establishing either a joint patriarchate or a single Greek patriarchate; the terms of the Treaty of Devol in 1108 nominally restored a Greek patriarch, although this was never enforced.
Under Manuel I Comnenus there was briefly a joint patriarchate when Antioch fell under Byzantine control, but for the most part there was only a Latin patriarch, up until the principality was recaptured by the Mamluks in 1268. A Greek patriarch continued to be appointed in Constantinople throughout this period.
See also: Patriarch of Antioch