In 1648 Wildeshausen and the surrounding district was ceded to Sweden, in the Peace of Westphalia, where it given as a fief to Gustav Gustavsson af Vasaborg, an illigitimate son of King Gustavus Adolphus, as a part of the Swedish Dominion of Bremen-Verden. In 1679, following the Treaty of Nijmegen, it was pawned, to the Prince-Bishop of Münster, in exchange for a loan of 100,000 Riksdaler.