Timeline

Heritage classified

Key figures

Origin and history

The present building of the Prefecture of the Ardennes occupies the site of the former Palace of the Tournelles, built in 1409 by Philippe le Bon, Duke of Burgundy, and rebuilt in 1566 by Louis de Gonzague. In 1697, a fire ravaged the palace, and part was rebuilt in 1732. In 1748, the Earl of Argenson and Nicolas de Chastillon founded the Royal School of Engineering of Mézières, which was installed in 1753. The school trained engineering officers until its closure in 1794.

The present building was built between 1780 and 1789 for the school, with notable contributions such as the meridian of the time traced by Gaspard Monge. After the Revolution, the prefecture settled there in 1800, and the General Council of the Ardennes occupied the western wing in 1790. In 1863, two pavilions and one grid were added. During World War I, the German headquarters was there.

The school, initially directed by Chastillon, forms figures like Coulomb, Monge and Carnot. His program combines mathematics, technical drawing and military practice. After reforms (1762, 1776) and a transfer to Metz in 1794, it merged in 1807 with the Châlons Artillery School. The building, partially classified in 1972, now houses the prefecture and hotel of the Department.

Among the illustrious students are Louis-Alexandre Berthier, Lazare Carnot and Jean-Charles de Borda. School plays a key role in the modernization of fortifications and mapping under the Old Regime. His legacy persisted in later engineering schools, such as that of Angers (1945).

The facades, roofs and park have been protected since 1972. The site, marked by centuries of military and administrative history, remains a symbol of the Ardennes heritage and French engineering.

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