In Greek mythology, Xanthius (Greek: Ξάνθιος) was a descendant of Bellerophon, and father of Leucippus and an unnamed daughter. Through the wrath of Aphrodite, Leucippus fell in love with his own sister. The passion turned out too strong for him to suppress, so he addressed his mother, imploring her to help him and threatening that he would kill himself if she didn't. She united the girl to Leucippus, and they consorted for a while. But the girl was already betrothed to another man, to whom someone reported the matter. The groom went on to inform Xanthius, without telling him the name of the seducer. Xanthius went straight to his daughter's chamber, where she was together with Leucippus right at the moment. On hearing him enter, she tried to escape, but Xanthius hit her with a dagger, thin