 In Piers Anthony's fantasy world Xanth, the law forbids reigning queens, thereby excluding a Sorceress from ruling.But when in "Night Mare" one Magician after another falls to an invasion's hostile magic and it appears that no more Magicians exist to take the throne, the last Magician king observes that although the law forbids reigning queens, it nowhere states that the post of king is reserved to males.Hence, several Sorceresses reign as King.