Portrait of Sultan Ahmet I (1603-1617), Above a View of the Hippodrome and the "Blue Mosque" in Istanbul, c1805. The scene below the seated figure of Sultan Ahmet is an allegorical reference to his reign, presenting symbols such as the keys to the Ka¡¦ba; a turban from the favored order of dervishes; the so-called Blue Mosque, which he built; and the nearby Hippodrome.