Karl Marx (1818–1883) was one of the most influential political philosophers in Europe. His theory of dialectical materialism and his thoughts on class struggle and socialism in collaboration with Friedrich Engels (1820–1895) have shaped the political landscape of the 20th century.
Karl Marx (1818–1883) in London, black-and-white photograph, 1875, photographer: John Jabez Edwin Paisley Mayall (1813–1901); source: International Institute of Social History, BG A9/362, https://hdl.handle.net/10622/83C88A4F-0AC8-47DA-BE63-C13D5F2B7ECC.