Ægeus became alarmed at his success, especially as he had contracted a friendship with the Pallantidæ, who were his rivals, and he therefore caused Androgeus to be murdered at Œnoë, in Attica, as he was on his way to a sacred festival at Thebes.
1873, Thomas Henry Dyer, chapter II, in Ancient Athens: its history, topography, and remains, William Clowes and Sons, page 58