Fortress built in 1393-94 on the Asian side of the Bosphorus, in preparation for the first, unsuccessful, siege of Constantinople by Sultan Bayezid I. Over a half-century later, Mehmed II the Conqueror used it, in tandem with the newly-built Rumeli Hisarı on the European side, to close the Bosphorus for his successful siege of 1453.
Fortress built in 1393-94 on the Asian side of the Bosphorus, in preparation for the first, unsuccessful, siege of Constantinople by Sultan Bayezid I. Over a half-century later, Mehmed II the Conqueror used it, in tandem with the newly-built Rumeli Hisarı on the European side, to close the Bosphorus for his successful siege of 1453.