Been a while since we had one of these! So, honors to the first commenter who can tell me where this image comes from:
UPDATE: Hmm, nobody's even tried to guess yet. So maybe a clue is in order — but what sort of clue can I provide without — in the age of Googlepedia — giving everything away?
OK, here's the clue: This is a still image from a movie. The movie was financed by a wealthy European nobleman who was threatened with excommunication by the Catholic Church for having financed it.
I hope that was helpful. Somebody better guess right soon, because I'm not posting anything else until someone gets it!