Events from the year 1639 in Ireland.

Incumbent Monarch: Charles I

Events Richard Nugent, 1st Earl of Westmeath, builds Clonyn Castle overlooking Delvin, County Westmeath. Theobald Stapleton publishes (in Brussels) a catechism in the Early Modern Irish language, or, in Irish, . It is the first Roman Catholic book in which the Irish language is printed in the antiqua typeface and the first notable attempt to simplify Irish orthography.

Arts and literature Autumn – James Shirley's play Saint Patrick for Ireland opens at the Werburgh Street Theatre in Dublin. Deaths March 8 – Edward King, Church of Ireland Bishop of Elphin July 26 – Henry O'Brien, 5th Earl of Thomond, peer (b. 1588) Approximate date – Muircheartach Óg Ó Cíonga, writer and priest (b. c.1562)

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