William IV of Jülich was a nobleman who ruled the Duchy of Jülich in the late 15th century. He was born around 1425 and became Duke in 1466. His reign was marked by efforts to strengthen the duchy's political and economic position in the region. William IV was also known for his involvement in the complex politics of the Holy Roman Empire. He played a significant role in various alliances and conflicts, particularly with neighboring territories like Berg and Cleves. His leadership helped shape the future of Jülich and its influence in the area.