Elis, or Eleia (Greek, Modern: Ήλιδα Ilida, Ancient: Ἦλις Ēlis; Doric: Ἆλις Alis; Elean: Ϝαλις Walis, ethnonym: Ϝαλειοι) is an ancient district, that corresponds with the modern Elis peripheral unit. It is in southern Greece on the Peloponnesos peninsula, bounded on the north by Achaea, east by Arcadia, south by Messenia, and west by the Ionian Sea.
The first Olympic festival was organized in Elean land, Olympia, Greece by the authorities of Elis in the 8th century BCE - with tradition dating the first games at 776 BCE. The Hellanodikai, the judges of the Games, were of Elean origin.
The local form of the name was Valis, or Valeia, and its meaning, in all probability, “the lowland” (compare with the word "valley"). In its physical constitution Elis is similar to Achaea and Arcadia; its mountains are mere offshoots of the Arcadian highlands, and its principal rivers are fed by Arcadian springs.
According to Strabo, the first settlement was created by Oxylus the Aetolian who invaded there and subjugated the residents. The city was built - as Strabo says - in 471 BC. The city had the authority of the Olympic games and believed to be a holy city, so was unwalled.
The spirit of the games had influenced the formation of the market: beside the bouleuterion to the parliament - which was housed in one of the gumnasium also - all the other buildings were relative to the games: two gymnasiums, one palaestra , the House of Hellanodikai, the Hellanodicae stoa. Pausanias describes the buildings of the Agora and the Hellanodicae stoa