Karl Heinrich Marx (May 5, 1818, Trier, Germany – March 14, 1883, London) was an immensely influential philosopher, political economist, and socialist revolutionary. While Marx addressed a wide range of issues, he is most famous for his analysis of history in terms of class struggles, summed up in the opening line of the introduction to the Communist Manifesto: "The history of all hitherto existing society is the history of class struggles." ---------------------------------------------- At the same time as Engels, Marx took part in the political and philosophical struggle of his times, writing the Communist Manifesto a year before the Revolutions of 1848, although the two events had nothing to do with each other. Marx had broken with his university environment, German Idealism and the Young Hegelians, and took part in the debates of the European workers' movement, in particular in relation with the First International founded in 1864. He published the first volume of Das Kapital in 1867, a few years before the 1871 Paris Commune. The influence of his ideas, already popular during his life, was given added impetus by the victory of the Russian Bolsheviks in the 1917 October Revolution, and there are few parts of the world which were not significantly touched by Marxian ideas in the course of the twentieth century. The relation of Marx's own thought to the popular "Marxist" interpretations of it during this period is a point of controversy; he himself once said that "the only thing I know is that I'm not a Marxist" (in response to the views of a French Social-Democratic Party calling itself "Marxist"). While Marx's ideas have declined in popularity, particularly since the collapse of the Soviet regime, they are still very influential today, both in academic circles, some worker movements, and in political practice, and Marxism continues to be the official ideology of some Communist states and political movements.