1784 Denis Diderot died 31 July. Voltaire, Rousseau and Diderot have all died within a period of a few years and French philosophy had thus lost three of its greatest enlightened free thinkers. Rousseau's thinking on the nobility of life in the wilds, facing nature as a naked savage still had great force to influence the next generation as the romantic movement gained momentum. Beaumarchais wrote "The Marriage of Figaro". Maria and Harriet Falconar publish "Poems on Slavery". The anti-slavery movement was growing in power and many poems and pamphlets were published on the subject.