 The former campaign, recorded by the "Annals of Ulster", consisted of involvement in the ill-fated invasion of mainland Scotland, launched by Somairle mac Gilla Brigte, King of the Isles.Mac Lochlainn was slain in 1166, leaving Mac Murchada to fend off his own enemies alone.Other than Mac Murchada himself, another man making a bid for the high-kingship was Ruaidrí Ua Conchobair, King of Connacht.