Petasus

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Hermès Ingenui with petasus, Roman copy of a 5th century BCE Greek original, Pio-Clementino Museum, Vatican.
Hermès Ingenui with petasus, Roman copy of a 5th century BCE Greek original, Pio-Clementino Museum, Vatican.

Petasus is a sun hat of Thessalian origin worn by the ancient Greeks, often in combination with the chlamys cape. As a winged hat it became the symbol of Hermes, the Greek mythological messenger god (Roman equivalent Mercury). Also spelled petasos, it was notably worn by French cartoon character Asterix.