The first English Parliament to include members outside the nobility, is summoned by Simon de Montfort after his forces defeated and captured King Henry III and his heir, Prince Edward, at the Battle of Lewes in May 1264. His victory made de Montfort the de facto ruler of England.
Although Montfort rule did not last long, the concept of a more representative Parliament which for the first time, was composed not only of nobles and bishops but also elected representatives; two knights from each county and two citizens (or burgesses) from each town, took hold, setting an important precedent for future parliaments. Henry III's son and successor, Edward I, adopted the practice of including knights and burgesses in parliament, which became standard procedure by the end of the 13th century.