In Greek mythology, Eurybia (/jʊəˈrɪbiə/; Ancient Greek: Εὐρυβία or Εὐρυβίη means 'of broad sway') was a Thespian princess as one of the 50 daughters of King Thespius and Megamede, daughter of Arneus[1] (or by one of his many wives[2]). She bore Heracles a son, Polylaus.[3]