Excerpts from Books and Wikipedia
"When Simon's last baronial supporter deserted him, Edward led a large army against him and Simon was killed at the Battle of Evesham in 1265. However, when Edward became king, he made sure that his parliaments included representatives from the towns and counties, the first step in the foundation of modern parliamentary democracy." [Furtado: 1001 Days] "The Battle of Evesham brought an end both to the Second Barons’ War against the crown and to the power of Henry III. It would be two years before final terms of peace were signed, and eight before Henry III’s reign finally ended. But from the moment of victory at Evesham, Edward—twenty-six years old, six foot two and towering over his peers, hardened by constant service in his father’s army—was the real ruler of England." [Bauer: Renaissance World, p. 362-3]