1102 in Ireland

Incumbents

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

Events

• Arnulf de Montgomery, Lord of Pembroke, being banished from England and Wales for joining with his brother in rebellion against Henry I of England, serves his father-in-law, Muirchertach Ua Briain, High [King of Ireland]; Henry imposes a trade embargo against Ireland.
• Betrothal of Muirchertach Ua Briain's daughters: Lafracoth to Arnulf de Montgomery and Bjaðmunjo to Sigurd.
• Archbishop Anselm of Canterbury writes to Muirchertach Ua Briain urging ecclesiastical reform and restoring good relations between him and Henry I of England.
• Domnall Ua Conchobair becomes King of Connacht

Births

• Gilla na Naemh Ua Duinn, poet, historian and cleric.
• Approximate date and probable location – Harald IV Gille of Norway.

Deaths

• Mugrón Ua Morgair, archlector of Armagh.
• Domnall Ua Ruairc, King of Connacht and Breifne.