The Aethiopis or Aithiopis (Greek: Αἰθιοπίς, Aithiopis; Latin: Aethiopis) is a lost epic of ancient Greek literature. It was one of the Epic Cycle, that is, the "Trojan" cycle, which told the entire history of the Trojan War in epic verse. The story of the Aethiopis comes chronologically immediately after that of the Homeric Iliad, and is followed by that of the Little Iliad. The Aethiopis was sometimes attributed by ancient writers to Arctinus of Miletus (see Cyclic poets). The poem comprised five books of verse in dactylic hexameter.
The Aethiopis was probably composed in the seventh century BC, but there is much uncertainty about its date. Ancient sources date Arctinus to the eighth century; but the earliest artistic representations of one of the most important characters, Penthesilea, date to about 600 BC, suggesting a much later date.
In current critical editions only five lines survive of the Aethiopis' original text. We are almost entirely dependent on a summary of the Cyclic epics contained in the Chrestomathy attributed to an unknown "Proclus" (possibly to be identified with the 2nd-century AD grammarian Eutychius Proclus). Fewer than ten other references give indications of the poem's storyline.
The poem opens shortly after the death of the Trojan hero Hector, with the arrival of the Amazon warrior Penthesileia who has come to support the Trojans. She has a moment of glory in battle, but Achilles kills her. The Greek warrior Thersites later taunts Achilles, claiming that he had been in love with her, and Achilles kills him too. Achilles is ritually purified for the murder of Thersites.