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Transylvania, historic eastern European region, now in Romania. After forming part of Hungary in the 11th–16th centuries, it was an autonomous principality within the Ottoman Empire (16th–17th century) and then once again became part of Hungary at the end of the 17th century. It was incorporated into Romania in the first half of the 20th century. The region, whose name first appeared in written documents in the 12th century, covered a territory bounded by the...