The
Society of the Friends of the Constitution , after 1792 re-named
Society of the Jacobins, Friends of Freedom and Equality , commonly known as the
Jacobin Club (
Club des Jacobins) or just collectively
Jacobins (, ), was the most famous and influential political club in the development of the
French Revolution. Initially founded by anti-Royalist deputies from Brittany, the Club grew into a nationwide republican movement, with a membership estimated at a half million or more. The Jacobin Club was heterogeneous and included both prominent parliamentary factions of the early 1790s, the radical
Mountain and the more moderate
Girondists.