Macbeth, King of Scotland
On 14 August 1040, Macbeth murdered his cousin King Duncan I in battle and was crowned King of Scotland. Macbeth was defeated by Duncan's son Malcolm (Canmore) and his ally Siward of Northumbria at Dunsinane Hill in 1054. Specifics of Macbeth's death are uncertain, being mortally wounded in skirmishing about the Cairn o'Mounth Pass into the Dee Valley, or at the Battle of Lumphanan on 15 August 1057. Macbeth was succeeded by his stepson Lulach the Simple (son of Gruoch by her first marriage), although Lulach's authority extended only over northern Scotland.