I studied Anne Boleyn myself for “The Tudors,” which I did myself under my own steam because I think it’s important as an actor to know what really did happen so that you can sort of be informed about the choices you make. Even if the text steers away from the reality because there will always be artistic interpretation, of course, you know what really did happen.
It’s always good to be informed. Although and you could argue similarly with “Game of Thrones,” it’s like to read the books and even though the scripts may diverge away from the books and as a series continues, how true is the series going to be to the books and everything. I think it’s always good for an actor to be as informed as they possibly can be about where their texts come from.