In the 14th and 15th centuries the family provided several bailiffs (Amtmänner) of Fredeburg.
The Old Salt Road from Lüneburg to Lübeck runs through the nature park – at several places, such as Fredeburg, still as a medieval route - the Alte Salzstraße.
Goddert II von Hanxleden (b about 1340, d 1410) was Lord (Burgmann) of Grevenstein and Fredeburg, Drost in Nyle in the Duchy of Jülich.