The collapse of the Angevin Empire was largely due to King John's incompetence, as the empire's stability relied on the specific political skills of Henry II and Eleanor of Aquitaine.

“And especially it's a lot of land to keep together if you're not very bright and you are kind of a prick.”

The personality and leadership qualities of individual kings were critical in determining the success and stability of their kingdoms during the medieval period.

“The more I read about history, particularly English history, the more I realize it's really dependent on the king. Edward II, terrible, England was in the doldrums. I know this is a simplistic view of it. Edward III, great king, England rose again.”