Edward I took an active role in government even before he succeeded to the throne, fighting on behalf of his father Henry III during the Second Barons' War of 1264-7. This civil war was the closest England came to overthrowing the monarchy before the Commonwealth period of the seventeenth century. At the Battle of Lewes, in Sussex, in 1264, Henry III was captured by the rebel barons. and their leader, Simon de Montfort, effectively took over rule of the kingdom. He began to institute far-reaching reforms, extending the basic form of parliamentary representation initiated by the Magna Carta to include non-nobles and representatives of each county. However, after fifteen months, Edward, who had been leading his royal army but had been …
Editors. "Reign of King Edward I". The Literary Encyclopedia. First published 31 July 2012; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=614, accessed 21 April 2015.]