1109 in Ireland

← 1108 1107 1106 1105 1104 1109 in Ireland → 1110 1111 1112 1113 1114
Centuries:	11th 12th 13th 14th
Decades:	1100s 1110s 1120s
See also:	Other events of 1109 List of years in Ireland

Events from the year 1109 in Ireland.

Incumbents

• High King of Ireland: Domnall Ua Lochlainn

Events

• An army was led by the High King, with the people of Northern Ireland, to Sliabh. However, Ceallach, successor of Patrick, made a year's peace between Mac Lochlainn and Ua Briain; after which the people with the Cinel-Conaill and Cinel-Eoghain, proceeded to attack the Ulidians; who in turn gave them the three hostages which they themselves selected.
• Fighting is recorded among Leinster dynasties, involving the Uí Cheinnselaig rival Leinster factions. These conflicts are recorded as violent clashes.^[1]

Deaths

• Maelisa Ua Cuillen, noble bishop of Northern Ireland^[2]

References

1. The Oxford Illustrated History of Ireland. Foster, RF. Oxford University Press, Oxford. 1989
2. "Part 21 of Annals of the Four Masters". celt.ucc.ie. Retrieved 2026-01-17.