The Château d'Écouen was built between 1538 and 1550 by the architect Jean Bullant for Anne de Montmorency, who was made Connétable de France in 1538. Anne de Montmorency had inherited the château in 1515, and his building campaigns were informed by his first-hand experience in overseeing royal works at Saint-Germain-en-Laye and Fontainebleau.
Anne de Montmorency was a major patron of the arts in France, and a protector of artists: his chapel was decorated with sculptures by Jean Goujon, and Jean Bullant, Barthélemy Prieur, Bernard Palissy. Some of the Androuet du Cerceau family found protection and work at Écouen. Unhappily, no building accounts survive, so the precise sequence of the construction cannot be closely followed; panels of grisaille stained glass in the gallery of the west wing are dated 1542 and 1544, and the east wing was paved in 1549-50. The building was frescoed and furnished during the 1550s, in the style of the School of Fontainebleau.
In 1787 the east (entrance) wing was demolished by the owner, the Louis Joseph de Bourbon, prince de Condé. When he emigrated at the Revolution, Château of Écouen fell to the State, as a 'national property'.
Following an idea of André Malraux the castle was thoroughly renovated by architects of the Monuments Historiques, after having served as a school for daughters of chevaliers of the Légion d'Honneur, from 1807 to 1962, in order to house the Musée de la Renaissance, comprising the Renaissance objects of the collections of the Musée de Cluny, in sympathetic surroundings. A series of small, highly focussed exhibitions have been staged at Écouen over the years since the museum fully opened in 1982.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.