Baldwin III of Flanders was a notable medieval ruler who reigned from 1036 to 1067. He was the son of Baldwin II of Flanders and Otto of Belgium, and he played a significant role in expanding the influence of the County of Flanders. His reign was marked by efforts to strengthen the region's economy and political power. Baldwin III is also known for his involvement in the Investiture Controversy, a conflict between the papacy and secular rulers over the appointment of church officials. His leadership helped to solidify Flanders as an important center of trade and culture in medieval Europe.