Keen local historian Jon Gunson has compiled this series entitled Friday Knight - knights who fought at the Battle of Lewes - giving each a brief biography.
Sir John was a Marcher Baron, Lord of Oswestry and Clun; he fought for the King at Lewes, and was taken prisoner. He married Maud de Verdun: they had a daughter called Joan, who married Richard de Cornwall, illegitimate son of Richard Plantagenet, Henry’s brother. In 1243 Sir John became jure matris Sixth Earl of Arundel: the Ninth Earl, Edmund, married John de Warenne’s granddaughter, Joan. Which is why there is a golden lion on the doormat of Lewes Town Hall.