The Iliad is attributed to Homer, although we don't know for sure who wrote it. It is thought to describe characters and legends traditionally dated to the 12th century B.C., passed down orally, and then written by a poet or bard identified as Homer who lived during the Archaic Age of Greece in the 8th century B.C. Here are major characters, both mortal and immortal, from The Iliad:
Achilles - The hero and subject of the epic poem. Achilles brought his troops known as the Myrmidons, was insulted by the leader of the Achaean (Greek) forces, and was sitting out the war until his close friend Patroclus was killed. Achilles then went after the man he blamed for the death, Hector, the prince of Troy.
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