My favourite subjects - Medusa

In Greek mythology, Medusa (Greek: Μέδουσα, Médousa, "guardian, protectress"[1]), was a monstrous chthonic female character, essentially an extension of an apotropaic mask, whose gaze could turn onlookers to stone.

Medusa was originally a beautiful nymph , but when she had intercourse with Poseidon in Athena's temple, the goddess transformed her hair to serpents and her made her face so terrible to behold that the mere sight of it would turn a man to stone.