Calvagh O'Donnell
Irish king (1515-1566) / From Wikipedia, the free encyclopedia
Calvagh O'Donnell (Irish: Calbhach Ó Domhnaill; c. 1515 - 26 November 1566), eldest son of Manus O'Donnell, was an Irish King of Tyrconnell of the mid-16th century. He was king and chief of the O'Donnell dynasty based in Tyrconnell in western Ulster. He is best known for his conflict with Shane O'Neill - a dispute that involved the intervention of the English government in Ireland on Calvagh's side.