Muirchertach Mac Lochlainn
Muirchertach Mac Lochlainn (died 1166), grandson of Domnall Ua Lochlainn, was king of Tír Eoghain and high king of Ireland from about 1156. He saw off a bid to overthrow him in 1159, but never broke the resistance of the Cenél Conaill and the Ulaid.
In 1166 he swore to the Bishop of Armagh to keep a truce with Ulaid, then seized and blinded its king. His allies deserted him, and he was cut down with sixteen followers; contemporaries read his death as Saint Patrick's vengeance.