The Perates or Peratae (Greek: Περατής, "to pass through"; πέρας, "to penetrate") were a Gnostic sect from the 2nd century AD. The Philosophumena of Hippolytus is our only real source of information on their origin and beliefs. The founders of the school were a certain Euphrates (whom Origen calls the founder of those Ophites to whom Celsus referred about 175 AD) and Celbes, elsewhere called Acembes and Ademes.