The following individuals were Earls (suo jure or jure uxoris) or Countesses (suo jure) during the reign of King Edward I of England who reigned from 1272 to 1307.
The period of tenure as Earl or Countess is given after the name and title of each individual, including any period of minority.
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.