His father used the style of prince de Vaudémont, although he held no corresponding territory, until 1708 when he received the allodial territory of Commercy from Leopold, Duke of Lorraine.
Mainz had to accept almost all of its possession in Upper and Lower Hesse as Hessian fiefs, only Fritzlar, Naumburg, Amöneburg and Neustadt remained as allodial Mainzer possessions in the area.
He also continued the "systematic acquisition policy" (planmässige Erwerbspolitik) in the Lüneburg principality that had operated since the time of Otto the Child, "rounding off the Lüneburg allodial estate" (Arrondierung des Lüneburger Allodialbesitzes) through the purchase of numerous lands and rights, including those of Bleckede and Hitzacker, the County of Dannenberg and the County of Wölpe.