Lulach mac Gille Coemgáin (Modern Gaelic: Lughlagh mac Gille Chomghain, known in English simply as Lulach, and nicknamed Tairbith, "the Unfortunate" and Fatuus, "the Simple-minded" or "the Foolish"; before 1033 – 17 March 1058) was King of Scots between 15 August 1057 and 17 March 1058.
Lulach was the son of Gruoch of Scotland, from her first marriage to Gille Coemgáin, Mormaer of …