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Marian Langiewicz, full name Marian Antoni Melchior Langiewicz (Polish pronunciation: [ˈmarjan laŋˈɡʲɛvit͡ʂ]; 5 August 1827, in Krotoszyn – 11 May 1887, in Istanbul), was one of the leaders of the Polish January Uprising against the Russian Empire in 1863.