They had two daughters, who, by the Treaty of Berum, waived their right to inherit Harlingerland, in favour of Enno's son Rudolf Christian, from his first marriage.
Sabine Catharine and her sister Agnes sold the Lordships of Esens, Stedesdorf, and Wittmund, and thus the entire Harlingerland, to their father, for 200000talers.
The Treaty was confirmed on 19 September 1600 by Emperor Rudolph II and later also by Archduke Albert, who was nominally Duke of Guelders and thereby liege lord of the Harlingerland.
In 1622, Ernst von Mansfeld stole the 300000talers, packed in barrels, which Enno III had prepared as payment for Agnes and her husband Prince Gundakar of Liechtenstein.
Since East Frisia under Prince George Christian still could not pay, the liege lord of the County if Rietberg, the Prince-Bishop of Münster, try to collect the debt.