Calvagh O'Donnell

Calvagh O'Donnell
Calbhach Ó Domhnaill
King of Tyrconnell
Tenure1563–1566
SuccessorHugh McManus O'Donnell
Bornc. 1515
Tyrconnell, Ireland
Died26 October 1566 (aged about 51)
Tyrconnell, Ireland
FatherManus O'Donnell
MotherJoan O'Reilly

Calvagh O'Donnell (Irish: Calbhach Ó Domhnaill; c. 1515 – 26 October 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.