Niall Cúlánach Ó Néill

Niall Cúlánach Ó Néill (c. 1231–1291), whose nickname means of the long back hair, was a son of Domhnall Óg and three times king of Tír Eoghain. In 1261 he took the kingship from his brother Hugh Boy but was defeated by Donnell Óg O'Donnell and expelled in 1262.

In 1286 Earl Richard Óg de Burgh installed him after deposing Donnell Ó Néill; Niall lost power and was restored before Donnell killed him in 1291. De Burgh then enthroned Hugh Boy's son Brian.