1574 in Ireland

Events from the year 1574 in Ireland.

Incumbent

May 8 – [Brian O'Neill dynasty|O'Neill (1574)|Brian O'Neill] of Clandeboye, having submitted to the Earl of Essex, begs Elizabeth I of England for mercy.
July 18 – the Geraldine chiefs sign the Combination, promising to support Gerald FitzGerald, 15th Earl of Desmond, unconditionally.
September 2 – Desmond submits to William FitzWilliam (Lord Deputy) at Cork following a month's campaign in Munster during which his castle at Derinlaur has been taken.
September – Essex campaigns against Turlough Luineach O'Neill.
November
* Essex meets Brian O'Neill of Clandeboye at his castle of Edendubhcarrig where at least 200 of the clan O'Neill are treacherously massacred at a feast while O'Neill himself, his wife and brother are captured, taken to Dublin, executed and quartered. The Lordship of Clandeboye is partitioned in three by the English.
* The rebel Rory O'More is briefly imprisoned.
November 5 – Edmund Tanner is appointed Roman Catholic Bishop of Cork and Cloyne and consecrated in Rome.