<P> In Sir Perceval of Galles (written in the early 14th century), the Black Knight jealously tied his wife to a tree after hearing she had exchanged rings with Perceval . Perceval defeated the black knight and explained that it was an innocent exchange . </P> <P> A supernatural Black Knight is summoned by Sir Calogrenant (Cynon ap Clydno in Welsh mythology) in the tale of Yvain, the Knight of the Lion . The Black Knight bests Calogrenant, but the Black Knight is later killed by Ywain (Owain mab Urien) when he attempts to complete the quest that Calogrenant failed . </P> <P> A black knight is the son of Tom a'Lincoln and Anglitora (the daughter of Prester John) in Richard Johnson's Arthurian romance, Tom a'Lincoln . Through Tom, he is a grandson of King Arthur's, though his proper name is never given . He killed his mother after hearing from his father's ghost that she had murdered him . He later joined the Faerie Knight, his half - brother, in adventures . </P> <P> A black knight is also mentioned La Morte D'Arthur: The Tale of Sir Gareth (book 4) as having been killed by Gareth when he was traveling to rescue Lyonesse . </P>

Who is the black knight in king arthur