Danaus, genus Danaus(noun)

type genus of the Danaidae: monarch butterflies

Danaüs

son of Belus, and twin-brother of Ægyptus, whom fearing, he fled from with his fifty daughters to Argos, where he was chosen king; by-and-by the fifty sons of Ægyptus, his brother, came to Argos to woo, and were wedded to, their cousins, whom their father provided each with a dagger to murder her husband, which they did, all except Hypermnestra, whose husband, Lynceus, escaping, succeeded her father as king, to the defeat of the old man's purpose in the crime.