Danaus in Wikipedia

Danaus, or Danaos ("sleeper";[citation needed] Greek Δαναός), in Greek mythology he was the twin brother of Aegyptus and son of Achiroe and Belus, a mythical king of Egypt. The myth of Danaus is a foundation legend (or re-foundation legend) of Argos, one of the foremost Mycenaean cities of the Peloponnesus. In Homer's Iliad, "Danaans" ("tribe of Danaus") and "Argives" commonly designate the Greek forces opposed to the Trojans. Danaus had fifty daughters, the Danaides, twelve of whom were born to Polyxo and rest to Pieria and other women, and his twin brother, Aegyptus, had fifty sons. Aegyptus commanded that his sons marry the Danaides. Danaus elected to flee instead, and to that purpose, he built a ship, the first ship that ever was...

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