On the day we visited Blue Mosque in summer 2011, we passed through Sultan Ahmet Square to go to Hagia Sophia. According to the flash cards from our hotel reception, Sultan Ahmet Square is the ancient Hippodrome. It was “built by Roman Emperor Septimus Severus in 203 AD. The Hippodrome served as a meeting place for politicians, for chariot races, wrestling, boxing and other athletic activities that took place. Constantine greatly enlarged the city and one of his major undertakings was the renovation of the Hippodrome. It is estimated that the Hippodrome of Constantine was about 450 metres long and 130 metres wide. Its stands were capable of holding 1000, 000 spectators.” Information taken from the mini flash cards. Photos from our camera.