Heracles was sent to Thrace by Eurystheus, to kidnap the man-eating mares of King Diomedes, which proved unexpectedly easy when, angered by the death of his friends, Heracles threw Diomedes himself to the mares, after which they became suddenly tame. Frustrated once again in his campaign to see Heracles ‘accidentally’ killed, Eurystheus let the horses go.

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