In around 911, the Viking adventurer Rollo was granted the city of Rouen and its surrounding district by the Frankish King Charles the Simple. Two further grants of territory followed in 924 and 933. But while Frankish kings might grant this land to Rollo and his son, William Longsword, these two Norman dukes and their successors had to fight and negotiate with rival lords, hostile neighbours, kings, and popes in order to establish and maintain their authority over it. This book explores the geographical and political development of what would become the duchy of Normandy, and the relations...