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.
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, thinking that he was slaying the seducer, and killed her.
When the truth was revealed, he had to leave the country and took part in colonization of Crete and the lands in Asia Minor.