Biennus should not be confused with Bionnus.
Biennus or Biennos (Greek, Ancient (to 1453);: Βίεννος) was a coastal town of ancient Crete. According to the Stadiasmus Maris Magni, it had a harbour and was located on the south coast of Crete, 12 stadia from Kriou Metopon (the southwest extremity of Crete) and 270 stadia from Phalasarna.[1]
The site of Biennus is tentatively located near modern Agios Ioannis, Ktista, near the southwestern extremity of Crete.