 The only "Erbbestandsbriefe" (“hereditary holding letters”, actually pledge agreements) issued by the "geistliche Güterverwaltung" (“spiritual administration of estates”) in Zweibrücken in the Dukes’ name that have been preserved, unfortunately, are the ones from the 18th century.They describe the lands belonging to the lordly estate, “gardens, meadows and cropland” and name the pledgeholders, who had to pay for their pledges at the monastery each year at Martinmas.To comply with the duties laid out in the agreements, they had to put up all their belongings as a surety.