Passauer Vertrag
Shortly thereafter, their territories were put at risk by the Imperial Edict of Restitution of 2 March 1629, when the Prince-Archbishops of Mainz and Trier claimed restitution of church properties that had been confiscated after the Peace of Passau of 1552. On 7 July 1629, the Reichskammergericht ruled that the House of Nassau had to return city and castle of Sarrewerden, Bouquenom and Wieberstweiler to the Bishopric of Metz as fiefs of Lorraine. They were allowed to keep their other disputed possessions.