Brian Chatha an Dúna Ó Néill

Brian Ó Néill, called Brian Chatha an Dúna (c. 1220–1260), ruled Tír Eoghain from 1238 and was acknowledged high king of Ireland in 1258. The son of Niall Ruadh, he crushed the Meic Lochlainn at Camergi in 1241, ending their long rivalry with the O'Neills.

In 1258 he was inaugurated King of the Gael. In 1260 he attacked the Normans at Downpatrick and fell at the battle of Drumderg; his head was sent to Henry III.