Karl Marx (/mɑːrks/; German pronunciation: [ˈkaɐ̯l ˈmaɐ̯ks]; 5 May 1818 – 14 March 1883) was a philosopher, economist, sociologist, journalist and revolutionary socialist. Born in Prussia (now Rhineland-Palatinate), he later became stateless and spent much of his life in London. Marx's work in economics laid the basis for much of the current understanding of labour and its relation to capital, and subsequent economic thought. He published numerous books during his lifetime, the most notable being The Communist Manifesto (1848) and Das Kapital (1867–1894).