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The Constitution of 3 May 1791 (Polish: Konstytucja 3 Maja 1791 roku) is an 1891 Romantic oil painting on canvas by the Polish artist Jan Matejko. It is a large piece, and one of Matejko's best known. It memorializes the Polish Constitution of 3 May 1791, a milestone in the history of the Polish–Lithuanian Commonwealth and a high point of the Polish Enlightenment.