Gille Coemgáin of Moray in the context of "Gruoch"

Macbethad mac Findláech (anglicised as Macbeth MacFinlay; died 15 August 1057), nicknamed the Red King (Middle Irish: Rí Deircc), was King of Scotland from 1040 until his death in 1057. He ruled during the period of Scottish history known as the Kingdom of Alba.

Little is known about Macbeth's early life, although he was the son of Findláech of Moray and may have been a grandson of Malcolm II, presumably through the latter's daughter Donada. He became Mormaer (Earl) of Moray – a semi-autonomous province – in 1032, and was probably responsible for the death of the previous mormaer, Gille Coemgáin. He subsequently married Gille Coemgáin's widow, Gruoch.

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"; c. 1032 – 17 March 1058) was King of Alba (Scotland) 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 Moray, and thus the stepson of Macbeth (Mac Bethad mac Findlaích). Through his mother, he was also the great-grandson of either Kenneth II or Kenneth III. Following the death of Macbeth at the Battle of Lumphanan on 15 August 1057, the king's followers placed Lulach on the throne. He has the distinction of being the first king of Scotland of whom there are inauguration details available: he was inaugurated, probably on 8 September 1057 at Scone. Lulach appears to have been a weak king, as his nicknames suggest, and ruled only for a few months before being assassinated and usurped by Malcolm III. However, it is also plausible his nicknames are the results of negative propaganda, and were established as part of a smear campaign by Malcolm III.