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).
Richard de Grey Richard de Grey (died 1271) of Codnor, Derbyshire, was a landowner who held many important positions during the reign of Henry III of England, including Warden of the Isles (Channel Islands) 1226-1227, 1229-1230 and 1252-1254, and later both constable of Dover Castle and Warden of the Cinque Ports from 1258 irregularly to 1264.