Orbán (died 1453), also known as Urban, 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.
He had offered his services to the Byzantines in 1452, a year before the Ottomans attacked the city, but the Byzantine emperor Constantine XI could not afford Orban's high salary nor did the Byzantines possess the materials necessary for constructing such a large siege cannon. Orban then left Constantinople and approached the Ottoman sultan Mehmed II, who was preparing to besiege the city. Claiming that his weapon could blast 'the walls of Babylon itself', Orban was given abundant funds and materials by the sultan. Orban managed to build the giant gun within three months at Adrianople, whence sixty oxen dragged it to Constantinople.
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