Cap of invisibility

[2] Wearers of the cap in Greek myths include Athena, the goddess of wisdom, the messenger god Hermes, and the hero Perseus.

[8][9] In some stories, Perseus received the Cap of Invisibility (along with the Winged Sandals) from Athena when he went to slay the Gorgon Medusa, which helped him escape her sisters.

[11] The Cap of Invisibility was not used to avoid the Gorgons' petrifying gazes, but rather to escape from the immortal Stheno and Euryale later on after he had decapitated Medusa.

In the same series, the main antagonist, Luke Castellan, stole Hades' Helm of Darkness, as well as Zeus' master bolt.

The helmet also appears in the Italian mythological comedy Arrivano i titani, but its invisibility powers work in this version only at night.