Didymateiche (grc|Δίδυμα τείχη), or Didymon Teichos (grc|Δίδυμον Τεῖχος, 'twin walled'), was a town of ancient Mysia. It belonged to the Delian League since it appears in tribute records of Athens between the years 454/3 and 418/7 BCE.[1] Polybius writes that it was among the places that were conquered by Attalus I, after the city of Carseae.
Its site is located north of Biga / Çanakkale, Turkey, Asiatic Turkey.