the magician-king of cornwall does not appear in other arthurian romance. in other stories, cornwall is ruled by either arthur's cousin cador, or by king mark, the uncle of tristan and husband of iseult. equally unique is cornwall's daughter, whom he had fathered on guinevere behind arthur's back. several arthurian staple characters do make appearances, such as guinevere, gawain, and tristan.