Diomedes, king of Argos, called Tydides, from his father; was, next to Achilles, the bravest of the Greeks at the Trojan war; fought under the protection of Athene against both Hector and Æneas, and even wounded both Aphrodité and Ares; dared along with Ulysses to carry off the Palladium from Troy; was first in the chariot race in honour of Patroclus, and overcame Ajax with the spear.

Diomedes, king of Thrace; fed his horses with human flesh, and was killed by Hercules for his inhumanity.