The twelve labors

In the eight labor, Herakles was ordered to bring alive the mares of Diomedes, king of Bistones at Thrace, who were fed with human flesh. Herakles, with the company of friends, seized the animals and entrusted them to his friend Abderos, who was unfortunate and eaten by them.
Herakles build the town of Abdera, to honor his friend.
There was a battle between Herakles and king Diomedes of Bistones. Herakles won the battle and the body of Diomedes was thrown to be eaten by his mares.
When the mares ate their master, became tame and Herakles set them free.
Later they were killed by wild beasts in the mount Olympus.