William IV, Duke of Bavaria was born on February 28, 1493, and became the Duke of Bavaria in 1508. He was a member of the House of Wittelsbach and ruled until his death in 1550. William IV is known for his efforts to consolidate the territories of Bavaria and for promoting the arts and education during his reign. He played a significant role in the Reformation in Germany, supporting the Lutheran movement while also maintaining a degree of religious tolerance. His leadership helped shape the political landscape of Bavaria, influencing its development in the early modern period.