ウェブMarquis de Sade. Donatien Alphonse François, Marquis de Sade ( French: [dɔnasjɛ̃ alfɔ̃z fʁɑ̃swa maʁki də sad]; 2 June 1740 – 2 December 1814) was a French writer, libertine, political activist and nobleman best known for his libertine novels and imprisonment for sex crimes, blasphemy and pornography.