1400 in Ireland

Events from the year 1400 in Ireland.

Incumbent

 * Lord: Henry IV

Events

 * O'Conor dynasty captured the Donamon Castle from House of Burgh.
 * Founding of a Dominican priory in Longford.

Deaths

 * Alexander de Balscot, Irish clergy
 * Brian Sreamhach Ua Briain, King of Thomond
 * Seoan, King of Breifne O'Reilly