The Tsar Cannon is an enormous cannon, commissioned in 1586 by Russian Tsar Feodor and cast by Andrey Chokhov. The cannon weighs 39.312 tonnesPortnov 1990, p. 20 and has a length of .Portnov 1990, p. 19 Its bronze-cast barrel has a diameter of , and an external diameter of (...) (from Wikipedia)