“Of the two pillars of Henry Plantagenet’s monument, the continental fiefs of the Angevin lands and an England that was assuming some of the early trappings of nationhood, the first did not survive the life span of his sons while the second continued on with varying fortunes to become a political unit that would occupy the center of world history and turmoil for seven centuries. The Angevin realm, like its creator, foundered on the ineptitude and pettiness of Henry’s sons.”