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Emmanuel Joseph Sieyès (3 May 1748 – 20 June 1836), usually known as the Abbé Sieyès, was a French Roman Catholic abbé, clergyman, and political writer who was the chief political theorist of the French Revolution (1789–1799); he also held offices in the governments of the French Consulate (1799–1804) and the First French Empire (1804–1815). Wikipedia