Niall O'Donnell

Niall O'Donnell was the third son of Aodh O'Donnell and the ninth O'Donnell chief, king of Tyrconnell from 1342 to 1343. In 1342 he surprised his brother Conchobar at night in Murbhach fortress, killed him and had himself proclaimed clan chief.

He ruled only a year before his eldest nephew Aonghus drove him out and took the kingship. In 1348 Niall was killed by his brother Maghnus at Inis-Saimer.