Culen of Scotland (also called Cuilean and Colin) was king of Scotland from 966 to 971. He was the son of King Indulf, and the third cousin of the previous king Dubh and of his successor Kenneth II. He was slain by the Britons of Strathclyde.
... designated anyone who assumed power for any period of time without a legitimate basis of authority.
The first to have the title of "Tyrant" was Pisistratus in 560 BC. ...