died Dec. 11, 1282, near Builth, Powys, Wales
Prince of Wales (1258–77).
As prince of Gwynedd in northern Wales from 1255, he sought to extend his rule throughout his native country, and he proclaimed himself prince of Wales in 1258. He fought the English lords of southern Wales (1262) and allied himself with Henry III 's opponent, Edward I but was defeated by him in 1277. He was killed in a final rebellion in 1282, and Wales soon fell entirely under English rule.