In the 9th century, when Raqqa served as capital of the western half of the Abbasid Caliphate, Dayra d'Mār Zakkā, or the Saint Zacchaeus Monastery, became the seat of the Syriac Orthodox Patriarch of Antioch, one of several rivals for the apostolic succession of the Ancient patriarchal see, which has several more rivals of Catholic and Orthodox churches.