1399 in Ireland

Events from the year 1399 in Ireland.

Incumbent

 * Lord: Richard II (until 29 September), then Henry IV

Events

 * June–August: Richard II of England’s second expedition to Ireland, with inconclusive results.
 * Battle of Tragh-Bhaile: forces of the Norman Lordship of Ireland defeat those of Henry O Neill's sons.

Deaths

 * 4 March – John FitzGerald, 4th Earl of Desmond, drowned.
 * Gilla na Naemh Mac Aodhagáin, a professor of Judiciary.