After coming to the throne aged just nine, Henry III spent much of his reign peaceably. Conciliatory and deeply religious, he created a magnificent court, rebuilt Westminster Abbey, and invested in soft power. Then, in 1258, the king faced a great revolution. Led by Simon de Montfort, the uprising stripped him of his authority and brought decades of personal rule to a catastrophic end. In the brutal civil war that followed, the political community was torn apart in a way unseen again until Cromwell.

Renowned historian David Carpenter brings to life the dramatic events in the last phase of Henry III's momentous reign. Carpenter provides a fresh account of the king's strenuous efforts to recover power and sheds new light on the characters of the rebel de Montfort, Queen Eleanor, and Lord Edward--the future Edward I. A groundbreaking biography, Henry III illuminates as never before the political twists and turns of the day, showing how politics and religion were intimately connected.