Hysiae or Hysiai (Ancient Greek: Ὑσιαί), also Hysia (Ὑσία), was a town of ancient Boeotia, in the Parasopia, at the northern foot of Mount Cithaeron, and on the high road from Thebes to Athens. It was said to have been a colony from Hyria, and to have been founded by Nycteus, father of Antiope.[1] Herodotus says that both Hysiae and Oenoe were Attic demoi when they were taken by the Boeotians in 507 BCE.[2] It probably, however, belonged to Plataea.[3] Oenoe was recovered by the Athenians; but, as Mt. Cithaeron was the natural boundary between Attica and Boeotia, Hysiae continued to be a Boeotian town. Hysiae is mentioned in the operations which preceded the Battle of Plataea.[4] Hysiae was in ruins in the time of Pausanias, who noticed there an unfinished temple of Apollo and a sacred well.[5] Hysiae is mentioned also by Euripides[6] and Thucydides.[7]
Its site is located near modern Kriekouki in Erythres.[8][9]