Powell, a member of Anthony Eden’s government in the 1950s, wrote this extended and detailed survey, he says, because no history of the upper house (as distinct from a history of Parliament) had ever been published. (Wallis is the scholar who took all of Powell’s research and whipped it into publishable shape.) The House of Lords exists because the successful exercise of authority requires seeking the counsel of "the most eminent or influential or representative of the governed," and there’s a surprising amount of structural continuity from the Witan, dating to King Alfred and before, to the early convocations of Duke William. The king’s court was gradually Normanized, however, and by the time King John had lost Normandy and been put in his place by the irritated barons, the upper levels of power in the kingdom had changed dramatically from what they had been a couple of centuries earlier. Powell attempts to cover only the first five hundred years of the Lords and he includes a good deal of genealogy and family history in sorting out aristocratic relationships. There are two dozen plates and hundreds of footnotes pointing the way to further research. As a politician, Powell was problematical at best, but he was an excellent historian.