What type of surety was the Earl of Pembroke who participated in the battle at Lincoln castle in 1217?
William Marshal, 2nd Earl of Pembroke William Marshal, 2nd Earl of Pembroke (French:"Guillaume") (1190 – 6 April 1231) was a medieval English nobleman and was one of Magna Carta sureties. He fought during the First Barons' War and was present at the Battle of Lincoln (1217).
Henry Herbert, 10th Earl of Pembroke Henry Herbert, 10th Earl of Pembroke, 7th Earl of Montgomery (3 July 173426 January 1794) was an English peer and politician. He was the son of Henry Herbert, 9th Earl of Pembroke, and was named after his father. His mother was Mary FitzWilliam, daughter of Richard FitzWilliam, 5th Viscount FitzWilliam. Through this marriage the Herberts in time inherited the substantial FitzWilliam properties in Dublin.