1133 in Ireland

← 1132 1131 1130 1129 1128 1133 in Ireland → 1134 1135 1136 1137 1138
Centuries:	11th 12th 13th 14th
Decades:	1110s 1120s 1130s 1140s 1150s
See also:	Other events of 1133 List of years in Ireland

Events from the year 1133 in Ireland.

Incumbents

• High King: Toirdelbach Ua Conchobair

Events

• A major epidemic affecting cattle occurred, called maelgarbh (“cow mortality”), described as unprecedented since an earlier great mortality of cattle.
• A raid on Ardbraccan occured in this year.^[1]

Deaths

• Flaithbheartach Ua Flaithbheartaigh, killed by the son of Lochlainn Ua Lochlainn.^[2]

References

1. "Ardbraccan – Meath History Hub with Noel French". Retrieved 14 January 2026.
2. "Part 24 of Annals of the Four Masters". celt.ucc.ie. Retrieved 14 January 2026.