Count William IV of Holland was a nobleman who lived during the 14th century. He was a member of the House of Avesnes and played a significant role in the political landscape of the region. His reign was marked by efforts to strengthen the authority of the countship and manage conflicts with neighboring territories. William IV was also known for his involvement in the {Friesland} region, where he sought to expand his influence. His leadership contributed to the development of the {County of Holland}, which later became an important part of the {Duchy of Burgundy}. His legacy is remembered in the context of the evolving governance of the area.