Andrey CHOKHOV (act. 1586): Designed to defend the main gates of the Kremlin but never fired. Named for Tsar Fyodor Ivanovich (r. 1584-1598). The caliber is 890 mm. and the cannon weighs approximately 39312 kilograms. Considered the largest cannon in the world. Each of the four cast-iron cannonballs weighs a ton.