Jenny Julia Eleanor Marx, sometimes called Eleanor Aveling and known to her family as Tussy, was the English-born youngest daughter of Karl Marx. She was herself a socialist activist who sometimes worked as a literary translator. In March 1898, after discovering that her partner Edward Aveling had secretly married the previous year, she poisoned herself at the age of 43.

Capital: A Critique of Political Economy, also known as Capital, is a foundational theoretical text in materialist philosophy and critique of political economy written by Karl Marx, published as three volumes in 1867, 1885, and 1894. The culmination of his life's work, the text contains Marx's analysis of capitalism, to which he sought to apply his theory of historical materialism "to lay bare the economic law of motion of modern society", following from classical political economists such as Adam Smith and David Ricardo. The text's second and third volumes were completed from Marx's notes after his death and published by his colleague Friedrich Engels. Das Kapital is the most cited book in the social sciences published before 1950.