In Greek mythology, Achilles (/əˈkɪliːz/ ə-KIL-eez) or Achilleus (Ancient Greek: Ἀχιλλεύς, [a.kʰilˈleu̯s]) was a hero of the Trojan War, the greatest of all the Greek warriors, and is the central character of Homer's Iliad. He was the son of the Nereid Thetis and Peleus, king of Phthia.