Biannus or Biannos (Ancient Greek: Βιάννος), or Biennus or Biennos (Βίεννος),[1] also Bienna (Βίεννα),[2] was an inland town and polis (city-state)[3] of ancient Crete.
It appears, under the form Βίεννα, in the list of 22 cities of Crete of the sixth-century Byzantine geographer Hierocles.
The contest of Otus and Ephialtes with Ares is said to have taken place near this city.
The town minted coins in the Hellenistic period, some of which survive.
[3] Its site is located near modern Khorakia, Ano Viannos,[6][7] a hill northwest of modern Viannos, where remains have been found from the Orientalizing period to Roman times.