Duncan I of Scotland

Duncan I (c. 1001–1040), nicknamed An t-Ilgarach, the Sick, was king of Alba from 1034. A grandson of King Malcolm II, he succeeded his grandfather unopposed that year.

In 1039 he besieged Durham and was routed. The next year he marched into Moray, the domain of his war leader Macbeth, and was killed near Elgin in 1040, opening the way for Macbeth's kingship. He was the historical King Duncan of Shakespeare's Macbeth.