1101 in Ireland

Incumbents

• High King of Ireland: Domnall Ua Lochlainn

  Events

• Muirchertach Ua Briain of the Dál gCais proclaims himself High King of Ireland.
• At the Synod of Cashel, Muirchertach Ua Briain grants Cashel to the church as the seat of a metropolitan bishop.
• Muirchertach Ua Briain destroys the ringfort at Grianan of Aileach.
• Sailors from overseas raid Scattery Island.
• Gillafin mac Coulahan, King of Síol Anmchadha, is killed and succeeded by his predecessor's son, Diarmaid Ua Madadhan.

  Deaths

• Gilla na Naemh Ua Dunabhra, Chief Poet of Connacht.