Mary, Queen of Scots (1971)

As I've said, movies about real-life British royalty have a good track record with me. This one is by the same director (Charles Jarrott) as Anne of the Thousand Days, so it was apt to feel even more like a sequel thereto than The Private Life of Henry VIII.

The tale begins in 1560, when teenage Mary (34-year-old Vanessa Redgrave) is about to lose her first husband, King Francis of France (Richard Denning). Having no claim to his throne, she decides to return to Scotland, but Queen Elizabeth (Glenda Jackson) will not grant her safe passage through England to get there. Even when Mary arrives home by ship, she finds her reception rather lacking, thanks to the rise of Protestantism and attendant hostility to Catholics such as herself. Indeed, her next 27 years will be riddled with people seeking to undermine her, whether by making her a figurehead in practice, persuading her to renounce all authority, imprisoning her, or assassinating her.