Another well done Keira Knightly film, The Duchess (2008) tells the story of 18th century aristocrat Georgiana, Duchess of Devonshire, who was reviled for her extravagant political and personal life.
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Although this is a "costume drama", the strory of the central character is by turns breathtaking and heartbreaking. Although she was an aristocrat, because she was a woman of her times Georgina's rights were constricted -- and suffocated -- as was her happiness.
I came away with a feeling of having seen a beautiful bird frantically beating her wings against a gilded cage. "All my life" says the Duchess, "I've been fighting my way upstream".