At the siege of Constantinople in 1453, the Ottomans employed a number of cannons, anywhere from 12 to 62. They were built at foundries that employed Turkish cannon founders and technicians, most notably Saruca, in addition to at least one foreign cannon founder, Orban. Most of the cannons at the siege were built by Turkish engineers, including a large bombard by Saruca, while one cannon was built by Orban, who also contributed a large bombard. Orban was from Brassó, Kingdom of Hungary, before working for the Ottoman army in 1453. Ali's piece is assumed to have closely followed the outline of the large bombards used at the siege of Constantinople.