Jean-Paul Marat (24 May 1743 – 13 July 1793), born in the Principality of Neuchâtel, was a physician, political theorist, and scientist best known for his career in France as a radical journalist and politician during the French Revolution. His journalism was renowned for its fiery character and uncompromising stance toward "enemies of the revolution" and basic reforms for the poorest members of society. Marat was one of the more extreme voices of the French Revolution, and he became a vigorous defender of the sans-culottes; he broadcast his views through impassioned public speaking, essay writing, and newspaper journalism, which carried his message throughout France. Marat's radical denunciations of counter-revolutionaries supported much of the violence that occurred during the wartime phases of the French Revolution. His constant persecution of "enemies of the people," consistent condemnatory message, and uncanny prophetic powers brought him the trust of the populace and made him their unofficial link to the radical Jacobin group that came to power in June 1793. He was murdered in his bathtub by Charlotte Corday, a Girondist sympathizer.

The Reign of Terror (5 September 1793 – 28 July 1794) (the latter is date 10 Thermidor, year II of the French Revolutionary Calendar), also known simply as The Terror (French: la Terreur), was a period of violence that occurred after the onset of the French Revolution, incited by conflict between rival political factions, the Girondins and the Jacobins, and marked by mass executions of "enemies of the revolution." The death toll ranged in the tens of thousands, with 16,594 executed by guillotine (2,639 in Paris), and another 25,000 in summary executions across France.

The guillotine (called the "National Razor") became the symbol of the revolutionary cause, strengthened by a string of executions: Marie Antoinette, King Louis XVI, the Girondins, Philippe Égalité (Louis Philippe II, Duke of Orléans) and Madame Roland, as well as many others, such as pioneering chemist Antoine Lavoisier, lost their lives under its blade. During 1794, revolutionary France was beset with conspiracies by internal and foreign enemies. Within France, the revolution was opposed by the French nobility, which had lost its inherited privileges. The Roman Catholic Church was generally against the Revolution, which had turned the clergy into employees of the state and required they take an oath of loyalty to the nation (through the Civil Constitution of the Clergy). In addition, the First French Republic was engaged in a series of wars with neighboring powers intent on crushing the revolution to prevent its spread.

Jean Paul (21 March 1763 – 14 November 1825), born Johann Paul Friedrich Richter, was a German Romantic writer, best known for his humorous novels and stories.

Jean Paul was born at Wunsiedel, in the Fichtelgebirge mountains (Bavaria). His father was an organist at Wunsiedel. In 1765 his father became a pastor at Joditz near Hof, and in 1767 at Schwarzenbach, but he died on 25 April 1779, leaving the family in great poverty. After attending the Gymnasium at Hof, Jean Paul went in 1781 to the University of Leipzig. His original intention was to enter his father's profession, but theology did not interest him, and he soon devoted himself wholly to the study of literature. Unable to maintain himself at Leipzig he returned in 1784 to Hof, where he lived with his mother. From 1787 to 1789 he served as a tutor at Töpen, a village near Hof; and from 1790 to 1794 he taught the children of several families in a school he had founded in nearby Schwarzenbach.

Jean Paul began his career as a man of letters with Grönländische Prozesse ("Greenland Lawsuits", published anonymously in Berlin) and Auswahl aus des Teufels Papieren ("Selections from the Devil's Papers", signed J. P. F. Hasus), the former of which was issued in 1783-84, the latter in 1789. These works were not received with much favour, and in later life Richter himself had little sympathy for their satirical tone. A spiritual crisis he suffered on 15 November 1790, in which he had a vision of his own death, altered his outlook profoundly. His next book, Die unsichtbare Loge ("The Invisible Lodge"), a romance published in 1793 under the pen-name Jean Paul (in honour of Jean Jacques Rousseau), had all the qualities that were soon to make him famous, and its power was immediately recognized by some of the best critics of the day.

Peter Ulrich Weiss (8 November 1916 – 10 May 1982) was a German writer, painter, and artist of adopted Swedish nationality. He is particularly known for his plays Marat/Sade and The Investigation and his novel The Aesthetics of Resistance.

Weiss was born in Nowawes (now part of Potsdam-Babelsberg), Brandenburg, to a Hungarian Jewish father and Christian mother. At age three he moved with his family to Bremen, and then during his adolescence to Berlin where Weiss began training for a career as a visual artist. In 1934 he emigrated with his family to Chislehurst, near London, England, where he studied photography at the Polytechnic School of Photography, and then in 1937-1938 attended the Prague Art Academy. After the German occupation of the Sudetenland in 1938, his family moved to Sweden, and Weiss himself removed to Switzerland. In 1939 he again emigrated to Stockholm, Sweden, where he lived for the rest of his life. He became a Swedish citizen in 1946.

Weiss was married three times: to the painter Helga Henschen, 1943; to Carlota Dethorey, 1949; and to the hereditary baroness Gunilla Palmstierna, 1964. He was politically active as a member of the Communist Party of Sweden, and in 1967 participated in Bertrand Russell's tribunal against the Vietnam War in Stockholm.