King Duncan I, born Donald was a male anthropomorphic duck.
Duncan I was born as Donald, the seventh leader of a clan in medieval Scotland. As was common for Scottish clan-leaders at the time, he styled himself King and hit anyone who disagreed with a club. However, he later managed to actually become King of Scotland, renaming himself Duncan I. He was killed in battle in 1040 by Macbeth. It is believed that Duncan I may have been a distant ancestor of Donald Duck; he was, at any rate, his namesake.