Jahan Kosha Cannon

Jahan Kosha Cannon (also known as the Great Gun, and literally means the Destroyer of the World) is placed in the Topekhana, 400 m to the south east of the Katra Mosque, in the town of Murshidabad, West Bengal, India.

Topekhana was the Nawab's Artillery Park and the entrance gate of the old capital of Bengal, Bihar and Orissa, the city of Jahangir Nagar.

The cannon is made of ashtadhatu or 8 metals, namely silver, gold, lead, copper, zinc, tin, iron and mercury.

[3] The cannon was made in 1637 by Janardan Karmakar, a blacksmith and gunsmith, under the instructions of Daroga Shere Mohammad and under the supervision of Hara Ballav Das.

[4] The cannon was made in Dacca, when Shah Jahan was the Mughal emperor, at the instance of Islam Khan, who was the Subedar of Bengal.