Latin Patriarchate of Constantinople

The Latin Patriarchate of Constantinople was an office established as a result of the Fourth Crusade and its conquest of Constantinople in 1204. It was a Catholic replacement for the Eastern Orthodox Ecumenical Patriarchate of Constantinople and remained in the city until the reconquest of Constantinople by the Byzantines in 1261, whereupon it became a titular see with only ceremonial powers. St. Peter's Basilica was the patriarchium, or papal major basilica assigned to the Patriarch of Constantinople, where he officiated when visiting Rome. The office was abolished in 1964.