Fête de la Fédération

14 July 1790, on the Champ de Mars

At the Fête de la Fédération on Paris's Champ de Mars on 14 July 1790, France marked the first anniversary of the Bastille's fall with a carefully staged celebration of national unity. Banners represented all 83 departments, and the Élysée's account reports 100,000 volunteer troops.

Talleyrand, bishop of Autun, celebrated Mass at the altar of the nation, with 300 assisting priests in that account. La Fayette, mounted on a white horse, swore loyalty to the nation, law and king on behalf of the National Guard.

Assembly president Charles de Bonnay took an oath for the deputies and their electors. The Assembly's official minutes record its procession from the Tuileries as part of the federated army's column.

The king's turn

Louis XVI then publicly swore to use the power delegated to him by the state's constitutional law to maintain the Constitution decreed by the National Assembly and accepted by him, and to execute the laws.

The oath placed him publicly within the developing constitutional order. It did not enact, or constitute his formal acceptance of, the completed Constitution of 1791.

The date this listing is reaching for

No authoritative source consulted identifies a discrete July 1790 act literally called "Louis XVI accepts a constitutional monarchy." The wording appears to descend from an unsourced year-list entry.

The best identifiable July event is this oath, so the date here is a reconstruction from evidence rather than a direct match. France's first completed written constitution was adopted on 3 September 1791, and Louis formally accepted and swore fidelity to it in September 1791.

What the ceremony produced was a powerful public image of reconciliation among king, Assembly, National Guard and crowd. It did not complete the constitutional project or create a new constitutional instrument that day.