Hydra (mythology)
ancient serpent-like chthonic water monster, with reptilian traits, that possessed many heads, in Greek mythology
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Antonio del Pollaiolo: Hercules and the Hydra
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Gustave Moreau: Hercules and the Hydra
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Francisco de Zurbarán: Struggle of Hercules with the Hydra of Lerna (1634).
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Fountain of Herkules in Olomouc