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This collection represents the surviving output of the clerks of the men and women of the most powerful magnate dynasty in England, Wales and Ireland in the thirteenth century. Its greatness was short-lived, but as a result of the Marshals' spread of interests and marriage alliances the charters and letters edited here embrace a remarkable diversity of lordships and societies. That fact and the central place the two Earls William Marshal held at the court of the young Henry III between 1216 and 1231, playing a decisive role in the establishment of Magna Carta, give this collection a unique interest for medieval historians of Britain and France, more so perhaps than for any other contemporary magnate family.

This book combines a simple dual biographical study of Waleran of Meulan and Robert of Leicester, the twin sons of Robert, Count of Meulan and Earl of Leicester, with an exploration of the exercise of power in twelfth-century Normandy and England. The twins were dominant and colourful characters, whose lives reveal many new points about the politics of the period, in particular the Norman rebellion of 1123–4, the wars of Stephen's reign in Normandy and England and the early years of Henry II. The book analyses the twins' followings, revenues and lands, and studies their relations with the church, their level of literacy, and heraldry. It also contains the first in-depth study of Norman feudal society in the duchy itself, suggests reasons why Normandy was more difficult to govern than England, and explores the use of patronage in twelfth-century society.