Duchy of Normandy
In the Duchy of Normandy, the 1077 marriage between Raoul II and Isabelle de Montfort allowed the Tosnys to direct the châtellenie of Nogent-le-Roi, which they held onto until around 1200. The family possessions thus stretched as far as the border of the duchy of Normandy. They were particularly active during the troubles which followed William I's death (1087) and the subsequent conflict between Empress Mathilda and Stephen (1135–1144).