1399 in Ireland

Incumbent

• Lord: Richard II, 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.