A.E.K. Athens F.C. () is a Greek football club. The team is based in Nea Filadelfia, Athens. It is one of the most successful Greek clubs. AEK was established on 13 April 1924 by Greek people who left Constantinople (Istanbul) during the Greco-Turkish War. AEK Athens, is the only Greek football club that has been advanced to the Semi-Finals of the UEFA Cup, in 1977. They have rivalries with Panathinakos, Olympiacos, and PAOK.