The Faerie Knight was, in the Matter of Britain, a bastard son of Tom a'Lincoln and Caelia, the Faerie Queen.
Tom was a bastard of King Arthur with a girl called Angelica, therefore, the Faerie Knight was, like Melehan, Melou and the Black Knight, Arthur's grandson.
The Faerie Knight inherriated some of his mother's magical talents.
The Faerie Knight met his half brother, the Black Knight (another bastard of Tom's), and they traveled together on many adventures.