Domhnall Óg Ó Domhnaill

Donnell Óg O'Donnell, was a medieval Irish king of Tyrconnell and member of the O'Donnell dynasty. He was a leading figure in the resistance to Anglo-Norman rule in the north west and closely related to many of the movement's most prominent figures, such as Hugh McFelim O'Connor, who is often credited as being the first to import Scottish gallowglass warriors. He should not be confused with a descendant of the same name who was a nephew of Rory O'Donnell, 1st Earl of Tyrconnell, and was the ultimate beneficiary-in-remainder to the Lordship of Tyrconnell.