Nicolas Harlay de Sancy built a château on the former lands of Saint-Victor abbey at the start of the 17th century. This was still incomplete in 1616, when it was sold to Charles de Valois (1573–1650), count of Auvergne then duke of Angoulême (1619), illegitimate son of Charles IX of France by Marie Touchet. de Valois completed the château around 1640, notably building the enclosing wall (1623) and the two wings. On his death in 1650 the estate passed to his granddaughter, wife of Louis, Duke of Joyeuse.
In 1718, the estate was bought by Samuel-Jacques Bernard (1686-1753), son of the financier Samuel Bernard, who commissioned the woodwork in the salon Régence. He then sold it to Germain Louis Chauvelin in 1731, who in 1762 sold it in turn to François Marie Peyrenc de Moras. She left it to her great-niece Anne Marie de Merle de Beauchamps in 1771 - Anne Marie was daughter of an ambassador to the king of Portugal and wife of Pierre Paul Gilbert des Voisins, président to the parlement de Paris. She and her husband sold it to the comte de Provence in 1776.
It was confiscated as national property on the French Revolution and sold on 9 November 1797 to Paul Barras. Later, Barras was exiled to Belgium and sold the château, in 1801, to général Moreau. In 1804, after Moreau's arrest, Napoleon I bought the château via Fouché and in 1805 granted it to maréchal Berthier, prince of Wagram. Berthier spent much money embellishing it, expanding the library, the galerie des Batailles, the salon de l'Empereur and the salon des Huissiers. He also built two more pavilions and the entrance gate across the road. He enlarged the estate to make it the best hunting-ground in the French Empire and gave grand festivals there. His son Napoléon Berthier expanded the library, which included over 3,000 works.
The last prince of Wagram, Alexandre Louis Philippe Marie Berthier, died without issue in 1918, leaving Grosbois to his sister, the princesse de la Tour d’Auvergne, and to his nephew, prince Godefroy de la Tour d’Auvergne. In 1962, René Ballière bought the estate to set up a training centre for racehorses.
Designed by an unknown architect, the château de Grosbois is clearly influenced by those designed by Jacques Androuet du Cerceau. On a U plan, it is made up of a central wing curved into an exedra, flanked by two pavilions of the same height and by two lower wings at right angles. It is built on a rectangular platform in the middle of a once water-filled moat, now dry. It is reached by three bridges.References:
The Porta Nigra (Latin for black gate) is the largest Roman city gate north of the Alps. It is designated as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier UNESCO World Heritage Site. The name Porta Nigra originated in the Middle Ages due to the darkened colour of its stone; the original Roman name has not been preserved. Locals commonly refer to the Porta Nigra simply as Porta.
The Porta Nigra was built in grey sandstone between 186 and 200 AD. The original gate consisted of two four-storied towers, projecting as near semicircles on the outer side. A narrow courtyard separated the two gate openings on either side. For unknown reasons, however, the construction of the gate remained unfinished. For example, the stones at the northern (outer) side of the gate were never abraded, and the protruding stones would have made it impossible to install movable gates. Nonetheless, the gate was used for several centuries until the end of the Roman era in Trier.
In Roman times, the Porta Nigra was part of a system of four city gates, one of which stood at each side of the roughly rectangular Roman city. The Porta Nigra guarded the northern entry to the Roman city, while the Porta Alba (White Gate) was built in the east, the Porta Media (Middle Gate) in the south, and the Porta Inclyta (Famous Gate) in the west, next to the Roman bridge across the Moselle. The gates stood at the ends of the two main streets of the Roman Trier, one of which led north-south and the other east-west. Of these gates, only the Porta Nigra still exists today.
In the early Middle Ages the Roman city gates were no longer used for their original function and their stones were taken and reused for other buildings. Also iron and lead braces were broken out of the walls of the Porta Nigra for reuse. Traces of this destruction are still clearly visible on the north side of the gate.
After 1028, the Greek monk Simeon lived as a hermit in the ruins of the Porta Nigra. After his death (1035) and sanctification, the Simeonstift monastery was built next to the Porta Nigra to honor him. Saving it from further destruction, the Porta Nigra was transformed into a church: The inner court of the gate was roofed and intermediate ceilings were inserted. The two middle storeys of the former gate were converted into church naves: the upper storey being for the monks and the lower storey for the general public. The ground floor with the large gates was sealed, and a large outside staircase was constructed alongside the south side (the town side) of the gate, up to the lower storey of the church. A small staircase led further up to the upper storey. The church rooms were accessible through former windows of the western tower of the Porta Nigra that were enlarged to become entrance doors (still visible today). The top floor of the western tower was used as church tower, the eastern tower was leveled, and an apse added at its east side. An additional gate - the much smaller Simeon Gate - was built adjacent to the East side of the Porta Nigra and served as a city gate in medieval times.
In 1802 Napoleon Bonaparte dissolved the church in the Porta Nigra and the monastery beside it, along with the vast majority of Trier"s numerous churches and monasteries. On his visit to Trier in 1804, Napoleon ordered that the Porta Nigra be converted back to its Roman form. Only the apse was kept; but the eastern tower was not rebuilt to its original height. Local legend has it that Napoleon originally wanted to completely tear down the church, but locals convinced him that the church had actually been a Gaulish festival hall before being turned into a church. Another version of the story is that they told him about its Roman origins, persuading him to convert the gate back to its original form.
In 1986 the Porta Nigra was designated a World Heritage Site, along with other Roman monuments in Trier and its surroundings. The modern appearance of the Porta Nigra goes back almost unchanged to the reconstruction ordered by Napoleon. At the south side of the Porta Nigra, remains of Roman columns line the last 100 m of the street leading to the gate. Positioned where they had stood in Roman times, they give a slight impression of the aspect of the original Roman street that was lined with colonnades. The Porta Nigra, including the upper floors, is open to visitors.