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Mac Lochlainn survived an attempt byRuaidrí Ua Conchobair to unseat him in 1159. He failed, however, to overcome the resistance of theCenél Conaill and theUlaid. In 1166, to attempt to achieve a diplomatic settlement with his neighbours, Mac Lochlainn arranged a truce and took hostages from many of the families in Ulaid. In return he had given a solemn oath to theBishop of Armagh and many other notables for his good behaviour. In violation of the oath, he had Eochaid mac Con Ulad Mac Duinn Sléibe,king of Ulaid, seized and blinded.
Mac Lochlainn's allies abandoned him almost at once, and he was reduced to a handful of followers. With sixteen of these closest associates, he was killed and his death attributed to the vengeance ofSaint Patrick.
Ó Cróinín, Dáibhí,Early Medieval Ireland: 400–1200. Longman, London, 1995.ISBN0-582-01565-0
"Muirchertach Mac Lochlainn and the "Circuit of Ireland","Donnchadh O Corrain, inSeanchas: Studies in Early and Medieval Irish Archaeology, History and Literature in Honour ofFrancis John Byrne, pp. 238–250.Four Courts Press, Dublin, 2000.
"Mac Lochlainn, Muirchertach," volume five,Dictionary of Irish Biography ... to the Year 2002, Cambridge, 2010.
CELT: Corpus of Electronic Texts atUniversity College Cork includes theAnnals of Ulster,Tigernach andthe Four Masters as well as Genealogies, and various Saints' Lives. Most are translated into English, or translations are in progress
