Duke William IV of Jülich was a noble ruler in the late 15th century, known for his leadership in the Duchy of Jülich, located in present-day Germany. He reigned from 1492 until his death in 1511, overseeing a period marked by political alliances and territorial disputes. His rule was characterized by efforts to strengthen the duchy's influence in the region. William IV was part of the House of Jülich, a significant noble family in the Holy Roman Empire. His reign contributed to the cultural and economic development of the duchy, as he engaged in various diplomatic relations and sought to enhance trade and agriculture within his territories.