Sir Leon is a recurring turned main character in BBC's Merlin. He first appears in "The Once and Future Queen."He is a member of the Knights of Camelot and of the Round Table. Leon is also one of Arthur's bravest and noblest of knights, one of Merlin's closest friends. It is also revealed in season 3 he was childhood friends with Gwen and Elyan, whose mother was a maid in Leon's household.