Count Robert I of Flanders, also known as Robert the Frisian, was a nobleman who ruled from 1071 until his death in 1111. He was a member of the House of Flanders and the son of Count Baldwin VI of Flanders. Robert played a significant role in the politics of medieval Flanders, a region that is now part of modern-day Belgium. During his reign, Robert I was known for his military prowess and efforts to strengthen the County of Flanders. He participated in the First Crusade and was involved in various conflicts with neighboring territories. His leadership helped to solidify Flanders as an important economic and political center in medieval Europe.