This is a new subject to me.

Georg Friedrich, Prince of Prussia, is locked in a legal battle for more than 10,000 family artifacts seized or lost after World War II. He is the great-great-grandson of Kaiser Wilhelm II. The link below is to a CNN feature story. Too long to cut and paste here, but very interesting.

https://www.cnn.com/style/article/hohenzollern-prince-georg-prussia/index.html

Dave