Black Knight (Arthurian legend)
The Black Knight appears in different forms in Arthurian legend.
In one tale he is a knight who 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. A supernatural Black Knight is also summoned by Sir Calogrenant (Cynon ap Clydno in Welsh mythology) in the tale of Yvain, the Knight of the Lion. Calogrenant is bested by the Black Knight, but the Black Knight is later killed by Ywain (Owain mab Urien) when he attempts to complete the quest that Calogrenant failed.
A black knight is also 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 thus a grandson of King Arthur, 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.