1118 in Ireland

Incumbents

• High King of Ireland: Domnall Ua Lochlainn

Events

• Synod of Ráth Breasail
• Enna mac Donnchada mac Murchada becomes King of Dublin.
• Cu Faifne mac Congalaig becomes King of Uí Failghe.
• Maelsechlainn Ua Faelain becomes King of the Déisi Muman.

Deaths

• Diarmait Ua Briain, King of Munster.
• Rogan mac Domnaill meic Conchobair, King of Uí Failghe.