these structures were built across europe from western france to present-day eastern poland in the 9th and 10th centuries, sometimes even as late as the early 13th century. one archaeologist has suggested that it could be part of a defensive network extending outwards from beedenbostel. more detailed research into the age of the palisade stakes that have been found on the site has not yet been possible due to financial constraints. as a result it can only be surmised that the castle was built before ad 995, perhaps together with the stone tower in beedenbostel or at the same time as the mundburg. the mundburg itself was built by the old confluence of the rivers aller and oker near wienhausen.