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).
William Russell (knight) Sir William Russell (1257–1311) was an English nobleman, knight, and holder of a "moiety" of the feudal barony of North Cadbury, Somerset, but spent most of his life engaged in the administration and defence of the Isle of Wight, where he obtained by marriage the manor of Yaverland. He served as constable of Carisbrooke Castle, and sat in parliament on two occasions, firstly as burgess for Great Bedwyn, Wiltshire, and then for the County of Southampton. As a baron his military service was called on several times by King Edward I "Hammer of the Scots".