No one has mentioned one of my very favorites, Lady Jane (1986), about the tragic, nine-day reign of Lady Jane Grey (briefly crowned queen right before Bloody Mary), which was one of Helena Bonham Carter's first movies (I think she was about fifteen when it was filmed. Also stars Cary Elwes, Patrick Stewart, Michael Hodern and John Wood (helluva cast) and I just adored it. You can watch it on Youtube; here's the first section.