Algernon Sidney

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Algernon Sidney or Sydney (15 January 1623 – 7 December 1683) was an English military officer, politician, and republican political theorist. A member of the middle part of the Long Parliament and commissioner of the trial of King Charles I of England, he opposed the king's execution. Sidney was later charged with plotting against Charles II, in part based on his most famous work, Discourses Concerning Government, which was used by the prosecution as a witness at his trial. He was executed for treason. After his death, Sidney was revered as a "Whig patriot—hero and martyr". The works of Algernon Sidney, along with those of contemporary John Locke, are considered as cornerstones of western thought. James Madison and Thomas Jefferson stated that Locke's Second Treatise on Government and Sidney's Discourses Concerning Government contained the "general principles of liberty and rights of man in nature and society". While Discourses Concerning Government cost Sidney his life, the ideas which...

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