The Samian Sibyl was the priestess presiding over the Apollonian oracle near Hera's temple on the Isle of Samos, a Greek colony. The word Sibyl comes (via Latin) from the ancient Greek word sibylla, meaning prophetess. There were many Sibyls in the ancient world but she is the one who prophesied the Birth of Jesus in the stable. The Samian Sibyl, by name Phemonoe, or Phyto of whom Eratosthenes wrote.

The Suidas lexicon refers that the Erythraean Sibyl was also called Samian. Pausanias confirms that Erythraean Sibyl has lived the greater part of her life in Samos (Phocis, 12, 5). The Samian Sibyl known as Phyto, or better Foito, from the Greek world foitos which indicates the wandering, especially the mind's. Modern researchers of the Samos island consider that her house was in the cave of Panagia Spiliani monastery which probably is also the cavern of Pythagoras, according to the testimonies of the neoplatonic philosopher Porphyry.

Interestingly the reference of Symeon Metaphrastes (the largest of the Byzantine historians), which says that Samian Sibyl existed when the city of Byzantium was built, the famous ancient colony of the Megarians, which was converted by Constantine the Great into the capital of the empire, after having rebuilt, and was called Constantinople. "During this time Sibyl is known in Samos, and the Byzantium was built under the Megarians".