Ancient Aethiopia, (Greek: Αἰθιοπία, romanized: Aithiopia; also known as Ethiopia) first appears as a geographical term in classical documents in reference to the upper Nile region, as well as certain areas south of the Sahara desert. Its earliest mention is in the works of Homer: twice in the Iliad, and three times in the Odyssey. The Greek historian Herodotus specifically uses the appellation to refer to such parts of Africa as were then known within the inhabitable world.