Florence IV, Count of Holland was a nobleman who ruled from 1299 until his death in 1345. He was a member of the House of Avesnes and succeeded his father, Florence III. His reign was marked by efforts to strengthen the county's economy and political influence in the region. During his rule, Florence IV faced challenges, including conflicts with neighboring territories and internal disputes. He worked to maintain stability and promote trade, which helped enhance the prosperity of Holland. His leadership contributed to the development of the region during the late medieval period.