10th Earl of Warwick (1298-1315) References Sources Ellis, Geoffrey. (1963) Earldoms in Fee: A Study in Peerage Law and History. London: The Saint Catherine Press, Limited. Morris, Marc. (2005) The Bigod Earls of Norfolk in the Thirteenth Century. Woodbridge: The Boydell Press. Spencer, Andrew M. (2014) Nobility and Kingship in Medieval England: The Earls and Edward I, 1272-1307. Cambridge: Cambridge University Press. Edward I of England