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July 12, 1790Reputable sourceWell documented

The Civil Constitution of the Clergy

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What happened

On 12 July 1790 the Assembly passed the Civil Constitution of the Clergy, placing the Catholic Church in France under state control. It reduced the number of bishops, made priests and bishops elected and salaried officials, and required the clergy to swear an oath of loyalty to the nation.

Why it matters

The law split the country: many priests and devout Catholics refused the oath, turning them against the Revolution and opening a deep religious rift that would feed years of counter-revolution.

Sources