In Assassin's Creed Unity, which historical event provides the game's setting?

The French Revolution provides the historical setting for Assassin's Creed Unity.

The game is set in Paris beginning in 1789 and follows Arno Dorian, who becomes involved with the Assassin Brotherhood after the death of his adoptive father. Major events of the French Revolution form the backdrop for his conflict with Templars and other factions.

The French Revolution began with the meeting of the Estates-General in 1789 and included the storming of the Bastille, the abolition of feudal privileges, the Reign of Terror, and the rise of Napoleon Bonaparte. Unity uses real locations and figures, although its Assassin-versus-Templar story is fictionalized.

The American Revolution belongs primarily to Assassin's Creed III, while the Russian Revolution is depicted in Assassin's Creed Chronicles: Russia. The Glorious Revolution occurred in England in 1688, almost a century before Unity's main events. Unity was released in 2014 and introduced a major cooperative multiplayer campaign feature.