Loch Key’s Cattle Plague
Archived: 24 October 2026
Abstract
In 1321, Irish annals recorded an unprecedented cattle murrain across Ireland, corroborated in Connacht, Ulster and Munster, where famine was also noted. The disease, of unknown cause, destroyed vital sources of food, labour, wealth and political obligation, exposing fragile recovery after earlier war and subsistence crises. Conflict nevertheless continued: Cathal Ó Conchobair destroyed the Rock of Loch Key and rivals were killed; Oriel endured dynastic mutilation and assassination involving Dundalk; Meath forces defeated Offaly chiefs; and a Munster hosting sought castles and hostages. These events reveal local, interwoven Gaelic and settler politics, but cattle mortality remained the year’s island-wide calamity.