Sir Niall Garbh O'Donnell was an Irish nobleman and soldier who alternately rebelled against and supported English rule in Ireland. During the Nine Years' War he defected from the Irish confederacy and sided with the Crown against his cousin Hugh Roe O'Donnell, with the aim of restoring the lordship of Tyrconnell to his own branch of the O'Donnell clan.
- Occupation
- military personnel
- Citizenship
- Ireland
- Born
- 1560
- Died
- 1626, 1625
