Cousin of Perceval and son of Calobrutus.
He was captured by Gohart of the Castle of the Whale, chained to a rock, and left to starve. He was sustained by the daughter of the Sick King until Perceval found him and freed him.
After Perceval captured Gohart, Calobrus chained his former captive to the same rock and likewise left him to die.
Source
Perlesvaus | Early 13th century