He was an expert in medieval institutions but also believed in relating history from personal perspectives. He argued that the reign of King John cannot be understood without an intimate knowledge of the barons and their families and the division of family lands at the time.
This scholar specialized in medieval institutions, yet he emphasized understanding history through individual viewpoints. He asserted that a comprehensive comprehension of King John's reign necessitates familiarity with the barons and their families, as well as the distribution of land holdings during that period.