Jacobin is separate and distinct from Jacobite and Jacobian.The Society of the Friends of the Constitution (French: Société des amis de la Constitution), commonly known as the Jacobin Club (Club des Jacobins, pronounced: [ʒa.kɔ.bɛ̃]), 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.