Seriously? I watched "Anno 1790" - a period "cop" drama, for a while, and had to look up the monarch causing all the unrest at the time. IIRC, that King Gustav was blood related to Frederick the Great.
Granted, I don't know, and frankly don't care about "royalty", so if Numbnutts XVI is or isn't of the same line, I still don't care, he's still a waste of O2.