Aegyptus

Aegyptus (Ancient Greek: Αἴγυπτος) was an Egyptian king from Greek mythology. He was a son of Belus and Achiroe as well as the twin brother of Danaus.

Mythology
Aegyptus was the father of fifty sons who he wished to wed to the fifty daughters of his brother Danaus, the Danaides. However, Danaus instructed his fifty daughters to murder their husbands on their wedding nights. Forty-nine of Danaus' daughters did what they were told, only one didn't kill her husband. Hypermnestra did not kill Lynceus because he honored her wish to remain a virgin.