Count Gerhard III of Holstein was a nobleman who lived during the late 12th century. He belonged to the House of Schauenburg and played a significant role in the political landscape of northern Germany. His reign was marked by efforts to consolidate power and manage the territories under his control. Gerhard III was known for his alliances and conflicts with neighboring regions, particularly with the Duchy of Schleswig and the Duchy of Saxe-Lauenburg. His leadership contributed to the development of the County of Holstein, which would later become an important area in the history of Germany.