At this time, the territory consisted of the regions formerly owned by the Counts of Northeim, the towns of Göttingen, Uslar, Dransfeld, Münden, Gieselwerder at the border with Hesse and half of Moringen.
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After his brother William had died in 1292, he was also able to acquire the subdivision around Wolfenbüttel against his elder brother Henry, who only retained Grubenhagen.
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Seesen and Gandersheim were separated from Brunswick-Göttingen and attached to Henry's part of Brunswick-Wolfenbüttel.