Ajax or Aias (/ˈeɪdʒæks/ or /ˈaɪ.əs/; Ancient Greek: Αἴας [a͜í.aːs], gen. Αἴαντος Aiantos) is a mythological Greek hero, the son of King Telamon and Periboea, and the half-brother of Teucer. He plays an important role, and is portrayed as a towering figure and a warrior of great courage in Homer's Iliad and in the Epic Cycle, a series of epic poems about the Trojan War. He is also referred to as "Telamonian Ajax", "Greater Ajax", or "Ajax the Great", which distinguishes him from Ajax, son of Oileus (Ajax the Lesser). In Etruscan mythology, he is known as Aivas Tlamunus.
Ajax is the son of Telamon, who was the son of Aeacus and grandson of Zeus, and his first wife Periboea. He is the cousin of Achilles, and is the elder half-brother of Teucer. Many illustrious Athenians, including Cimon, Miltiades, Alcibiades and the historian Thucydides, traced their descent from Ajax. The Italian scholar Maggiani recently showed that on an Etruscan tomb dedicated to Racvi Satlnei in Bologna (5th century BC) there is a writing that says: "aivastelmunsl" = "family of Telamonian Ajax".