On 28 June 1264 an ordinance was sealed by Parliament following the victory of the Montfortian party at Lewes six weeks earlier. It ordained that the king shall dispose of all the business of the realm, whether dispensing patronage or naming Crown officials, with the advice and consent of a council of nine. These nine would be chosen by three electors confirmed by the king, all elaborated by a system of checks and balances. Officially Henry III gave his “consent, will and precept” to this form of government, which for all intents and purposes changed England into a constitutional monarchy. Read the article here.