The Dardanelles Gun or Great Bronze Gun (Turkish: Şahi topu or simply Şahi) is a 15th-century siege cannon, specifically a super-sized bombard, which saw action in the 1807 Dardanelles operation. It was built in 1464 by Ottoman military engineer Munir Ali and modelled after the Basilic, the bombard crafted by Orban that was used for the Ottoman siege of Constantinople in 1453.
The bombard is a type of cannon or mortar which was used throughout the Late Middle Ages and the early modern period. Bombards were mainly large calibre, muzzle-loading artillery pieces used during sieges to shoot round stone projectiles at the walls of enemy fortifications, enabling troops to break in. Most bombards were made of iron and used gunpowder to launch the projectiles. There are many examples of bombards, including Mons Meg, the Basilic, the Dardanelles Gun, and the handheld bombard.
The weapon provided the name to the Royal Artillery rank of bombardier and the word bombardment.
Orban, also known as Urban (Hungarian: Orbán; died 1453), was an iron founder and engineer from Brassó, Transylvania, in the Kingdom of Hungary (today Brașov, Romania), who cast large-calibre artillery, Basilic, for the siege of Constantinople by the Ottomans in 1453.
Orban was Hungarian, according to most modern authors, while some scholars also mention his potential German ancestry. Alternative theories suggest he had Wallachian roots. Laonikos Chalkokondyles used the term Dacian to describe him.