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.