In Greek mythology, Pieria (Greek: Πιερία) was the wife of Danaus. According to the Library of Apollodorus, Danaus and Pieria had fifty daughters, the Danaides who married the fifty sons of Aegyptus. Danaus, however, instructed his daughters to kill their husbands on the first wedding night. All of them obeyed, but Hypermnestra refused. The legendary punishment of the forty nine Danaides was to try to fill up a hollow tank in Tartarus.