János Zsigmond was a significant historical figure in the 16th century, known for being the last prince of the Principality of Transylvania. He ruled from 1540 to 1551 and was a member of the Zsigmond family. His reign was marked by political instability and conflicts with the Ottoman Empire. During his rule, János Zsigmond sought to maintain the autonomy of Transylvania while navigating the complex relationships with neighboring powers. He was also known for his support of the Reformation, promoting religious tolerance in a time of significant religious upheaval in Europe.