The Gorgons Stheno and Euryale were immortal, whereas their Gorgon sister Medusa was mortal. The only story involving them is their pursuit of Perseus after he had beheaded Medusa. The Hesiodic
Shield of Heracles (c. late seventh – mid sixth century BC) describes the two Gorgons' pursuit of Perseus, as depicted on Heracles' shield: While the "great Fear" rioting upon the heads of the Gorgon, in the passage from the
Shield quoted above, might possibly be a vague reference to hair made of snakes, the poet
Pindar makes such a physical feature explicit, describing the two Gorgons, just like their sister Medusa, as having "horrible snakey hair" (
ἀπλάτοις ὀφίων κεφαλαῖς). According to Apollodorus' version of their story, all three Gorgons had the ability to turn to stone anyone who looked upon them. And when
Perseus managed to behead Medusa by looking at her reflection in his bronze shield, Stheno and Euryale chased after him, but were unable to see him because he was wearing
Hades' cap, which made him invisible. Euryale's lamenting cry, while chasing Perseus, is noted in two sources. Pindar has Athena create the "many-voiced songs of flutes" to imitate the "shrill cry" of the "fast-moving jaws of Euryale". While
Nonnus, in his
Dionysiaca, has the fleeing Perseus "listening for no trumpet but Euryale's bellowing". ==Iconography==