Emily Davison was a suffragette who campaigned for women's rights in the early 20th century. After she was arrested, she went on hunger strike, in which she resisted force-feeding. She is probably best known for throwing herself under the King's horse at the Derby in June 1913, becoming a martyr for her cause.  

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You can read more about Emily Davison here:

http://www.bbc.co.uk/history/historic_figures/davison_emily.shtml