He is best known for the creation of Mount Athos, a mountain and peninsula in Chalcidice, northern Greece, which is now an important centre of Eastern Orthodox monasticism.
In Greek it is commonly called Άγιον Όρος, meaning 'Holy Mountain'.
In one account however, he was said to be the son of Poseidon himself by the Naiad nymph Rhodope, daughter of the river-god Strymon (the modern Struma).
[1][2] The mountain took its name after this Athos, who was attacked by Poseidon, the god of the sea.
[4] Stephanus of Byzantium attributed the story to some lost work by Nicander, where he apparently described Poseidon hurling two blocks with his hands against the gigantic Athos.