Reign of Terror

The Reign of Terror, or simply the Terror, (AUDIO: The Scapegoat) was a period during the French Revolution in which the revolutionaries guillotined suspected enemies of state in their thousands. The period followed the execution of King Louis XVI in 1793. (PROSE: A History of Humankind) It was the First Doctor's favourite period in the history of Earth, (TV: The Reign of Terror) though the Twelfth Doctor would reflect that it was one of the most unpleasant. (PROSE: A History of Humankind)

History
The First Doctor and Susan visited Revolutionary-era France during the Reign of Terror, specifically July 1794, with Ian Chesterton and Barbara Wright accompanying them. (TV: The Reign of Terror)

One of the many people set to be guillotined during these reprisals was Louise, the chambermaid of the Marquis LeFoy, who had tried to help him escape France. While a version of her went on to suffer her historically-recorded fate, she was somehow duplicated and saved by Auteur, who took her to a Town outside of time where she got a new lease of life under the name of "Citizen 176". Auteur hoped to mould the girl into an "artistic spirit of vengeance", an ambition which was frustraded when 176 instead became friends with Graelyn Scythes and the Hollow Childe. (PROSE: White Canvas)

Robespierre was executed in 1794. (PROSE: A History of Humankind)

The Marquis de Sade narrowly survived the Reign of Terror: due to a clerical error his execution was postponed a few hours, during which the Reign fell. He was then freed. (PROSE: The Man in the Velvet Mask)