Duncan
In William Shakespeare's Macbeth, Duncan was the King of Scotland. In the play, Duncan was killed by his cousin and trusted general, Macbeth, at the insistence of Lady Macbeth.
An actor in the Karidian Company of Players portrayed the elderly King Duncan when the acting troupe performed Macbeth on Planet Q in 2266. (TOS: "The Conscience of the King")
The Shakespearean character is loosely based on a real king of Scotland of the same name who ruled from 1034 to 1040.