The Hippodrome of Constantinople (Turkish: Sultanahmet Meydanı, Turkish pronunciation: [sulˌtanahˈmet] or Atmeydanı) was a circus that was the sporting and social centre of Constantinople, capital of the Byzantine Empire. Today it is a square named Sultanahmet Meydanı (Sultan Ahmet Square) in the Turkish city of Istanbul, with a few fragments of the original structure surviving.