The Mares of Diomedes (Greek: Διομήδους ἵπποι), also called the Mares of Thrace, were four man-eating horses in Greek mythology. Magnificent, wild, and uncontrollable, they belonged to the giant Diomedes (not to be confused with Diomedes, son of Tydeus), king of Thrace, son of Ares and Cyrene who lived on the shores of the Black Sea. Bucephalus, Alexander the Great's horse, was said to be descended from these mares.
After capturing the Cretan bull, Heracles was to steal the Mares. In one version of the story, Heracles brought a number of youths to help him. They took the mares and were chased by Diomedes and his men.
Heracles was not aware that the horses, called Podargos (the swift), Lampon (the shining), Xanthos (the yellow) and Deinos (the terrible), were kept tethered to a bronze manger because they were wild; their madness being attributed to an unnatural diet of human flesh. Some versions say that they expelled fire when they breathed. They were man-eating and uncontrollable, and Heracles left his favoured companion, Abderus, in charge of them while he fought Diomedes, and found out that the boy was eaten. In revenge, Heracles fed Diomedes to his own horses, then founded Abdera next to the boy's tomb.
Diomedes (/ˌdaɪəˈmiːdiːz/ or /ˌdaɪˈɒmɪdiːz/) or Diomede (/ˈdaɪəmiːd/;Greek: Διομήδης Diomēdēs "God-like cunning, advised by Zeus") is a hero in Greek mythology, known for his participation in the Trojan War.
He was born to Tydeus and Deipyle and later became King of Argos, succeeding his maternal grandfather, Adrastus. In Homer's Iliad Diomedes is regarded alongside Ajax as one of the best warriors of all the Achaeans (behind only Achilles in prowess). Later, he founded ten or more Italian cities. After his death, Diomedes was worshipped as a divine being under various names in Italy and also in Greece.
Diomedes was, on his father’s side, an Aetolian, and on his mother's an Argive. This is because his father Tydeus left Calydon and fled to Argos in order to avoid being persecuted by his uncle Agrius. He married King Adrastus's daughter Deipyle.
Tydeus was one of the Seven Against Thebes. This expedition failed and all leaders, including Tydeus were killed. Tydeus was Athena’s favourite warrior at the time, and when he was dying she wanted to offer him a magic elixir (which she had obtained from her father) that would make him immortal. However, she withdrew the intended privilege in apparent disgust when Tydeus gobbled down the brains of the hated enemy who had wounded him.
King Diomedes of Thrace (Greek: Διομήδης) was a giant, the son of Ares and Cyrene. He lived on the shores of the Black Sea ruling the warlike tribe of Bistones. He is known for his four man-eating horses, which Heracles stole in order to complete the eighth of his Twelve Labours, slaying Diomedes in the process.
Heracles encounters King Diomedes through performing his eighth labour. Eurystheus, King of Tiryns and Heracles cousin, had sent Heracles to capture the Mares of Diomedes after he had completed his seventh labour, capturing the Cretan Bull. Heracles travelled to the shores of the Black Sea to meet King Diomedes. He was said to have been the son of the god Ares and Cyrene, who is said to be the daughter of Hypseus, King of the Lapiths. King Diomedes was a savage; he enjoyed feeding strangers and prisoners to his mares. They did not like the taste of oats and grain; instead they feasted on human flesh, which their master gave them willingly. His mares could not be controlled; they were savage, just like the King. They could not be tethered by regular rope; instead they needed to be tethered to a bronze manger by chains, so they would not escape.
Diomedes may mean: