Hermus or Hermos () was a deme of ancient Attica. It lay on the sacred road to Eleusis, between the Cephissus and the Pythium, a temple of Apollo on Mount Poecilum, upon a rivulet of the same name. Here was the splendid monument of Pythonice, the wife of Harpalus. The site of Hermus is tentatively identified with Chaidari. References Populated places in ancient Attica Former populated places in Greece Demoi