Elis (Ancient Greek: Ἦλις, Doric Greek: Ἆλις, in the local dialect: Ϝᾶλις, Modern Greek: Ήλιδα, romanized: Elida) was the capital city of the ancient polis (city-state) of Elis, in ancient Greece. It was situated in the northwest of the Peloponnese, to the west of Arcadia. Just before the Peneius emerges from the hills into the plain, the valley of the river is contracted on the south by a projecting hill of a peaked form, and nearly 500 feet (150 m) in height. This hill was the acropolis of Elis, and commanded as well the narrow valley of the Peneius as the open plain beyond. The ancient city lay at the foot of the hill, and extended across the river, as Strabo says that the Peneius flowed through the city; but since no remains are now found on the right or northern bank, it is probable that all the public buildings were on the left bank of the river, more especially as Pausanias does not make any allusion to the river in his description of the city.
Elis is mentioned as a town of the Epeii by Homer in the Catalogue of Ships in the Iliad; but in the earliest times the two chief towns in the country appear to have been Ephyra the residence of Augeias, in the interior, and Buprasium on the coast. Some writers suppose that Ephyra was the more ancient name of Elis, but it appears to have been a different place, situated upon the Ladon. Elis first became a place of importance upon the invasion of Peloponnesus by the Dorians. Oxylus and his Aetolian followers appear to have settled on the height which later formed Elis's acropolis as the spot best adapted for ruling the country. From this time it was the residence of the kings, and of the aristocratic families who governed the country after the abolition of royalty. Elis was the only fortified town in the country; the rest of the inhabitants dwelt in unwalled villages, paying obedience to the ruling class at Elis.