Cellach Ua Sinaig inherits the position of Abbot of Armagh (the seventh in a series of members of the Ua Sinaig family, who had held the position without taking holy orders, and several of whom had been married).
Roman Catholic Archdiocese of Armagh, a senior primatial and metropolitan see of Ireland
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He held a synod at Galway in 1523, attended by bishops of Kilmacduagh, Achonry Clonmacnoise, Kilfenora, Ross, in addition to representatives of the dioceses of Elphin, Killala and Armagh.