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In page Aeacus:

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In The Frogs (405 BC) by Aristophanes, Dionysus descends to Hades and proclaims himself to be Heracles. Aeacus, lamenting the fact that Heracles had stolen Cerberus, sentences Dionysus to Acheron to be tormented by the hounds of Cocytus, the Echidna, the Tartesian eel, and Tithrasian Gorgons.[citation needed]