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The Mares of Diomedes were four, magnificent, wild, uncontrollable, man-eating horses. They belonged to the giant Diomedes, King of Thrace,
This labour of Herakles was to steal them. In one version of the story, Herakles brought Abderus, one of his many male beloveds (eromenos), and some other youths to help him. They took the mares and were chased by Diomedes and his men.
Herakles was not aware that the horses were kept tethered to a bronze manger because they were wild, man-eating and uncontrollable, and Herakles left Abderus in charge of the horses while he fought Diomedes, but Abderus was eaten. In revenge, Herakles fed Diomedes to his own horses, then founded Abdera next to the boy's tomb.
http://en.wikipedia.org/wiki/Mares_of_Diomedes