William II, Duke of Julich-Berg, was a nobleman who ruled from 1511 until his death in 1539. He was part of the House of Jülich, a prominent family in the Holy Roman Empire. His reign was marked by efforts to strengthen his duchy and navigate the complex political landscape of the time. William II was known for his involvement in various alliances and conflicts, particularly with neighboring territories. He played a significant role in the War of the League of Cambrai, which involved several European powers. His leadership contributed to the historical significance of the Duchy of Jülich-Berg in the region.