Calvagh O'Donnell

Calvagh O'Donnell (Irish: Calbhach Ó Domhnaill; born c. 1515 - died 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. Life In the course of a quarrel with his father and his half-brother Hugh, Calvagh sought aid in Scotland from the Campbells, who with access to Scottish royal artillery were able to assist him in deposing Manus and securing the now very divided lordship of Tyrconnell for himself. Hugh then appealed to Shane O'Neill, chief of the neighbouring O'Neill dynasty, to restore him at Calvagh's expense. Shane accordingly invaded Tyrconnell at the head of a large army in 1557, desiring to make himself supreme throughout Ulster, and encamped on the shore of Lough Swilly. Calvagh, acting apparently on the advice of his father, who was his prisoner and who remembered the successful night attack on Conn O'Neill, 1st Earl of Tyrone at Knockavoe in 1522, surprised the O'Neills in their camp at night and routed them with the loss of all their spoils.