Constantine III of Scotland

Causantín mac Cuiléin, anglicised as Constantine III and called Constantine the Bald, was a son of King Cuilén and ruled the kingdom of Alba from 995 to 997. He is portrayed as conspiring against Kenneth II, who was killed at Fettercairn in 995, after which Constantine seized the crown.

His reign was a struggle with Kenneth II's son Malcolm and Malcolm's uncle Kenneth. In 997 he was killed in battle at Rathinveramon near Perth, and Kenneth III succeeded him.