Constantinople 1453 - Constantine XI Realized His He Was Too Hasty With The Giant Cannon Salesman..

He first offered his cannons to Constantine who declined. So he sold them to the Ottomans... One cannon designed by Orban was named "Basilica" and was 27 feet (8.2 m) long, and able to hurl a 600 lb (272 kg) stone ball over a mile (1.6 km).