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).
Ela of Salisbury, 3rd Countess of Salisbury Ela of Salisbury, 3rd Countess of Salisbury (1187 – 24 August 1261) was a wealthy English heiress and the "suo jure" Countess of Salisbury, having succeeded to the title in 1196 upon the death of her father, William FitzPatrick, 2nd Earl of Salisbury. Her husband William Longespée, an illegitimate half-brother of English kings Richard I and John assumed the title of 3rd Earl of Salisbury by right of his marriage to Ela, which took place in 1196 when she was nine years old.