A tyrant who, in Blackmore’s King Arthur, ruled France with an iron fist. Responding to please for justice from Clotar’s vassals, Arthur traveled to France and killed the king, by cutting off his head. In Blackmore’s allegory, Clotar represents Louis XIV.
A certain King Clothar I ruled the Franks in the middle of the sixth century.
Source
King Arthur: An Heroick Poem: In Twelve Books | Sir Richard Blackmore, 1697