Domhnall mac Conchobair Ó Briain (original) (raw)

Domhnall mac Conchobair Ó Briain, known in English as Sir Donnell O'Brien (died 1579) was a Gaelic Irish leader from Thomond in the Kingdom of Ireland. He is best known for his victory at the Battle of Spancel Hill, against his nephew who was supported by the English government of the Kingdom of Ireland, particularly the Earl of Sussex. Ó Briain was a contender for the title Earl of Thomond from 1553 to 1558 and again from 1563 to 1564.