Georgius de Hungaria

George of Hungary ( 1422–1502) was a Christian Hungarian who was forced as an Ottoman slave that escaped and reverted from Islam to Christianity, writing afterwards about his experiences. As per description, when George was 15 or 16, he was taken prisoner and sold into slavery when the Ottoman Turks invaded the town of Szászsebes (German: Mühlbach, now Sebeș, Romania) in 1438 during the Transylvanian campaign against the Kingdom of Hungary. George had arrived to the city a year earlier, probably to go to a school in the local Dominican monastery.

He would spend 20 years being a slave before he could escape, later becoming a monk in Rome. Here, he wrote a record of his experiences Tractatus de moribus, condicionibus et nequitia Turcorum ("Treatise on the morals, customs and treachery of the Turks"), published in 1481 in Latin. In 1529 it was translated into German and published along with a preface by Martin Luther. His work is considered one of the most important contemporary sources on the Ottoman Empire, providing detailed accounts of its customs, religion, social practices, and sects with exceptional accuracy for the period.

The ethnicity of George is not known, possibly being either a German or a Hungarian. It is thought that he grew up in a bilingual environment and did not have a clear concept of his national identity. After his escape from the Ottomans, George condemned Islam.