1140 in Ireland

← 1139 1138 1137 1136 1135 1140 in Ireland → 1141 1142 1143 1144 1145
Centuries:	11th 12th 13th 14th
Decades:	1120s 1130s 1140s 1150s 1160s
See also:	Other events of 1140 List of years in Ireland

Events from the year 1140 in Ireland.

Incumbents

• High King: Toirdelbach Ua Conchobair

Events

• A descendant of Patrick made a visitation to Connaught for the first time, and was praised.
• A battle was fought by the foreigners of Ath-cliath, over the foreigners of Port-Lairge, in which the son of Mac Tormair was slain.^[1]

Deaths

• Domhnall Ua Sealbhaigh, airchinneach of Corcach
• Raghnall, grandson of Dubhdara, chief of Muintir‑Eolais (killed in conflict).^[2]

References

1. "Part 24 of Annals of the Four Masters". celt.ucc.ie. Retrieved 15 January 2026.
2. Mac Carthaigh’s Book, ed. Séamus Ó hInnse (Dublin Institute for Advanced Studies)