The appearance of the massive form of Rumeli Hisari (Hisari meaning castle) on the European shore of the Bosphorus in the summer of 1452 signalled the doom of Byzantium. Built in only four months to face Anadolu Hisari across the narrowest point of the Bosphorus, it was part of Mehmet the Conquerer’s plan to isolate Constantinople by destroying any ship attempting to ferry supplies into the city. Thus it was nicknamed Bogazkesen (the throat-cutter) and immediately on completion sunk a foolhardy Venetian merchant ship with its long-range cannon. Now it plays host to more pacific activities, such as open-air theatrical and musical events through the summer nights.