If only medieval geneologies were more comprehensible to outsiders. We looked up Duke Ludwig, and lost our wits in names, cum barba or not (with beard, or not, we think) to find out more about the one who found a fabulous view of the Alps there, and started a fortress on this site. See://fmg.ac/Projects/MedLands/THURINGIA.htm Did the good duke have his wife's first husband murdered so he could marry her? That may have been the "cum barba."
The lands here, known as Thuringia, were part of the Soviet allocation after WWII - East Germany, the Iron Curtain. During the Middle Ages, the castle was known for its minstrel festivals and contests.
We forget that, during times of siege, the castle enclosed an entire living space, a mini-town.The defense could be sustained for a long period, so long as the well water and food held out. This cannon, of course, is not medieval. Perhaps 19th Century? See the history of small cannon at ://www.cannon-mania.com/history.htm