Meilyr FitzHenry (died 1220) was a Cambro-Norman nobleman and Lord Chief Justice of Ireland during the Lordship of Ireland. Meilyr FitzHenry was the son of Henry FitzHenry, an illegitimate son of King Henry I, by Nest, daughter of Rhys ap Tewdwr, the last king of Deheubarth (South Wales). He was thus related to the noblest Norman and native families of South Wales. Robert Fitz-Stephen, Maurice FitzGerald, David FitzGerald, bishop of St. David's, and William FitzGerald of Carew were his uncles. Meilyr's cousins included Raymond le Gros, Gerald of Wales, prince Rhys ap Gruffydd, the famous Lord Rhys, and Henry II. In 1158 his father, Henry FitzHenry, was killed in battle during Henry II's campaign in Wales. Meilyr, Henry's oldest son, succeeded to his father's possessions of Narberth and Pebidiog, the central and north-eastern parts of the modern Pembrokeshire. In 1169 he accompanied his uncle Fitzstephen on his first expedition to Ireland. He first distinguished himself in the invasion of Ossory along with his cousin Robert de Barry, older brother of Giraldus Cambrensis.
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