Karl Marx (1818–1883) was born in Trèves in the Rhineland. He studied law in Bonn, philosophy and history in Berlin, and received a doctorate from the University of Jena for a thesis on Epicurus (341–270 BC). (Epicurus' philosophy was a reaction against the ‘other-worldliness’ of Plato's theory of Forms. Whereas for Plato knowledge was of intelligible Forms, and the criterion of the truth of a hypothesis about the definition of a Form was that it should survive a Socratic testing by question and answer, for Epicurus the criterion of truth was sensation, and employment of this criterion favoured the theory with which Plato explicitly contrasted the theory of Forms (Sophist 246a–d), namely, the materialism of the atomists, Leucippus and Democritus.) Marx was editor of the Rheinische Zeitung of Cologne, 1842–1843. The paper was suppressed and he moved to Paris, becoming co-editor of the Deutsch-französische Jahrbücher, the one and only issue of which contained two articles by Marx and two by his friend, Friedrich Engels (1829–1895). Together they wrote The German Ideology (1846) and their most influential work, The Communist Manifesto (1848). Marx had been expelled from France in 1845, and went to Brussels, from where he was expelled during the 1848 revolutions. He went to Cologne to start, with Engels and others, a paper with a revolutionary editorial policy, the Neue Rheinische Zeitung. Expelled once again, Marx finally settled in London, working in the British Museum on his great historical analysis of capitalism, Das Kapital. The first volume was published in 1867, the remaining two volumes, completed by Engels after Marx's death, in 1885 and 1895.