I Googled this prince and would be interested to know what was so terrible about his private life. He was heir to the Dutch throne for most of his life, did he expect to succeed to that crown?
"Despite all his work for Weimar during his government, Wilhelm Ernst was a hated ruler. This was for his private life, when he was known to be a sadist; the day of his abdication, he was called the "most unpopular prince in all Germany".
He died in Heinrichau, Silesia."