Shortly thereafter, in 1315, he provided his acquisition with town rights because the surrounding region belonged to the principality of Brunswick-Wolfenbüttel, thus to enemies of the bishop of Hildesheim.
Varsti pärast seda, 1315. aastal, pakkus ta oma omandile linnaõigust, kuna ümberkaudsed alad kuulusid Braunschweig-Wolfenbütteli vürstkonnale, seega Hildesheimi piiskopi vaenlastele.