As an expert in historical events, I can provide you with the answer to your question. The person who threw themselves under the king's horse was Emmeline Pankhurst. She was a leading figure in the British suffragette movement, which fought for women's right to vote in the early 20th century. Pankhurst's act was a form of protest against the government's inaction on the issue of women's suffrage. She did not literally throw herself under a horse but was known for her militant tactics, which included hunger strikes and other forms of civil disobedience.

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Suffragette Emily Davison knocked down by King's horse at Epsom �C video. World news. The Guardian.read more >>