https://museen-in-bayern.de/en/museums/museum-details/festung-marienberg
Festung Marienberg (Marienberg Fortress) - Museen in Bayern
The Marienberg, which has been inhabited since the late Bronze Age, was probably the site of a fort of the Franconian-Thuringian dukes in the early 8th century...
festung marienbergin bayernfortressmuseen