William I, Count of Hainaut, was a nobleman who ruled in the 13th century. He was born around 1160 and became the Count of Hainaut in 1190. His reign was marked by efforts to strengthen his territory and maintain peace among the local nobility. He was also known for his involvement in regional politics and alliances. In addition to his role as Count, William I was connected to other important figures of his time, including Philip II of France and Richard the Lionheart. His lineage played a significant role in the history of the County of Hainaut and its influence in medieval Europe.