https://en.wikipedia.org/wiki/Edward_I_of_England
The years 1264–1267 saw the conflict known as the Second Barons' War, in which baronial forces led by Simon de Montfort fought against those who remained loyal to the King.The first scene of battle was the city of Gloucester, which Edward managed to retake from the enemy.When Robert de Ferrers, 6th Earl of Derby, came to the assistance of the rebels, Edward negotiated a truce …