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.
