Danaus is a term used in two distinct contexts:
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In Greek mythology, Danaus is the name of a king of Libya and Egypt, who was the son of Belus and the twin brother of Aegyptus. Danaus is most famous for his fifty daughters, known as the Danaids.
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In biology, Danaus is a genus of butterflies in the family Nymphalidae, which includes the well-known monarch butterfly (Danaus plexippus).