William the Marshal was a medieval knight and statesman who lived in the 12th and 13th centuries. He was a trusted advisor and loyal supporter of several English kings, including Henry II, Richard the Lionheart, and John. William the Marshal was known for his exceptional skills in combat and his chivalrous behavior. He played a key role in the politics and military conflicts of his time, and he is remembered as one of the most important figures of the medieval period.