Achilles (Ancient Greek: Ἀχιλλεύς, "Akhilleus") was a hero of the Trojan War and is the central character of Homer's "Iliad". The son of the mortal hero Peleus and the Nereid Thetis, he is the leader of the Myrmidons, and is described as the greatest of all the Achaean warriors. The "Iliad", which is set in the ninth year of the Trojan War, starts with a quarrel between Achilles and Agamemnon, the commander of the Greek forces.