I just got finished with a book about the three royal cousins and their involvement in World War One. It speaks at the end of Wilhems abdication, but all of the other kings of Germany as well. I am familiar with how the British system works with the dukes and duchys etc, but how can there be other kings? It refers to the King of Bavaria and a few others. How does this work? I know it's a stupid question, but to someone who grew up in the US, with little understanding, it doesn't make much sense. Also, I found it pretty awesome that through Victoria, all of European monarchs were related.