[1] According to archaeological evidence, there was a medieval fortification on the steep-sided, Liebenstein hill spur from the 12th to the 14th century.

[1] That said, Bohemian influence here is doubtful because the area in question was then uninhabited native forest.

It is quite likely that the present abandoned village of Ullersdorf was connected with this fortification and it may be assumed that it functioned as a local base during the colonization of the area.

The fortifications consisted of two simple ditches with an intermediate earth bank to seal it off from the hinterland.

[3] Today only wall remains and dressed stone blocks are still visible on the Liebenstein.