Count Baldwin I of Hainaut was a nobleman who lived during the 11th century. He is best known for his role in the establishment of the County of Hainaut, which is located in present-day Belgium. Baldwin was a member of the House of Flanders and played a significant part in the political landscape of the region. In 1096, Baldwin I became the first Count of Hainaut after inheriting the title from his father. He was also known for his involvement in the First Crusade, where he eventually became the King of Jerusalem. His leadership and military skills contributed to the expansion of his territories and influence in medieval Europe.