 During this period, Marx wrote some of his most notable works, including "The Eighteenth Brumaire of Louis Napoleon" and "Das Kapital".Throughout his time in London, Marx lived in financially straitened circumstances and was heavily reliant on the support of his friend and collaborator Friedrich Engels.Marx died on the afternoon of 14 March 1883 from a combination of bronchitis and pleurisy, exacerbated by an abscess on his lung.