Charles the Second of England, sorry.

First, sorry if this is too loosely related to the rules. I figured it fit as a question concerning European history, and /r/art's ID threads get about as much traffic as places that don't get a lot of traffic.

Anyway, I'm trying to help ID a painting as part of a favor/bet to a relative. Here it is, I think it's Charles II but I can't identify any source for the painting or the castle, based on its geography or on the patterns on the coronation jewels.

Thank you so much in advance.