1111 in Ireland

Incumbents

• High [King of Ireland]: Domnall [Ua Lochlainn]

Events

• Synod of Rathbreasail, presided over by Cellach Ua Sinaig, Roman [Catholic Archdiocese of Armagh|Abbot of Armagh] is held. Ireland is divided into territorial dioceses under two metropolitans, the Archbishop of Armagh and the Archbishop of Cashel.
• Domnall [mac Taidc] temporarily seizes the Kingdom of the Isles by force.