Count Gerhard I of Holstein was a nobleman who lived during the 12th century. He is known for being one of the early rulers of the County of Holstein, a region in present-day northern Germany. His leadership helped establish the foundations of the county's governance and influence in the area. Gerhard I was part of the House of Schauenburg, a prominent noble family. His reign contributed to the development of local power dynamics and alliances, which were crucial for the region's stability during a time of feudal conflicts and territorial disputes in medieval Europe.