Mary, Queen of Scots is a very enjoyable film, starring Vanessa Redgrave as Queen Mary Stewart of Scotland who should have been Queen of England as well as France.
There is also a brilliant performance by Glenda Jackson portraying her cousin Queen Elizabeth 1.
The film is not entirely historically accurate but accurate enough. The main inaccuracy is the meeting of the 2 Queens, they never ever met in life, although in death they are only feet away from each other in Westminister Abbey in London.

Despite the fact that Elizabeth prevented Mary from being Queen of England, after the death of Elizabeth, it was Mary's son who succeeded her, bringing about the Union of the Crowns, paving the way for the Act of Union, a century later.

Altogether fascinating politics and religious intrigue, worth watching and reading about that time.

( Just got to add a piece of trivia - the Stewart Dynasty was the longest lasting dynasty in the world)