The Civil Constitution of the Clergy (French: "Constitution civile du clergé") was a law passed on 12 July 1790 during the French Revolution, that caused the immediate subordination of the Catholic Church in France to the French government.
Earlier legislation had already arranged the confiscation of the Catholic Church's French land holdings and banned monastic vows. This new law completed the destruction of the monastic orders, outlawing "all regular and secular chapters for either sex, abbacies and priorships, both regular and in commendam, for either sex", etc. It also sought to settle the chaos caused by the earlier confiscation of Church lands and the abolition of the tithe.
Some of the support from this came from figures within the Church, such as the priest and parliamentarian Pierre Claude François Daunou, and, above all, the revolutionary priest Henri Grégoire, who was the first French Catholic priest to take the Obligatory Oath. The measure was opposed, but ultimately acquiesced to, by King Louis XVI.
Even before the Revolution and the Civil Constitution of the Clergy, the Catholic Church in France (the Gallican Church) had a status that tended to subordinate the Church to the State. Under the Declaration of the Clergy of France (1682) privileges of the French monarch included the right to assemble church councils in their dominions and to make laws and regulations touching ecclesiastical matters of the Gallican Church or to have recourse to the "appeal as from an abuse" ("appel comme d'abus") against acts of the ecclesiastical power.
Even prior to the Civil Constitution of the Clergy:
The following interlinked factors appear to have been the causes of agitation for the confiscation of church lands and for the adoption of the Civil Constitution of the Clergy:
On 6 February 1790, one week before banning monastic vows, the National Constituent Assembly asked its ecclesiastical committee (which was promptly expanded from 15 to 30 members) to prepare the reorganization of the clergy. No doubt, those who hoped to reach a solution amenable to the papacy were discouraged by the address of 22 March in which Pius VI spoke out against measures already passed by the Assembly; also, the election of the Protestant Jean-Paul Rabaut Saint-Étienne to the presidency of the Assembly brought about "commotions" at Toulouse and Nîmes, suggesting that at least some Catholics would accept nothing less than a return to the ancien régime practice under which only Catholics could hold office.