Sir William Marshall was a prominent English knight and nobleman in the 12th century, known for his exceptional skills in warfare and chivalry. Born around 1146, he served under several English kings, including King Richard the Lionheart and King John. Marshall was also a key figure in the Magna Carta negotiations, which established important legal principles in England. Throughout his life, Marshall earned a reputation for his loyalty and bravery, becoming one of the most celebrated knights of his time. He was awarded numerous titles and lands, and his legacy continued through his descendants, who played significant roles in English history.