Duke Wilhelm IV of Bavaria was a prominent ruler from the House of Wittelsbach, born on 15th April 1493. He became Duke of Bavaria in 1508 and is known for his efforts to strengthen the duchy during the early 16th century. Wilhelm IV was a patron of the arts and education, contributing to the cultural development of Bavaria. He played a significant role in the Reformation by maintaining a moderate stance, promoting religious tolerance. Wilhelm IV also focused on administrative reforms, improving the governance of his territories. His reign lasted until his death on 7th March 1550, leaving a lasting impact on Bavarian history.