The Château de Montgeoffroy is an 18th century manor house located in the commune of Mazé (Maine-et-Loire), France.
In 1676, Érasme de Contades acquired the property. In 1772, the Marshal Louis Georges Érasme de Contades, governor of Alsace, decided to rebuild the château as a retirement home. He called on the Parisian architect Jean-Benoît-Vincent Barré, who worked with the local architect Simier.
The marshal being far from Anjou, the work was directed primarily by his son, le marquis de Contades, his daughter-in-law, Julie Constantin de Marans, his mistress, Hélène Hérault, and her daughter-in-law, Marie-Marguerite Magon de La Lande. It took three years. The old château was burned down, but Barré appreciated its U shape and kept two towers and the moat, as well as the chapel, which dated from 1543.
The building miraculously survived the French Revolution and the Revolt in the Vendée conserving its common buildings, agricultural structures, chapel and park. It also kept its archives and its furniture, which was studied by Pierre Verlet.
First record of Kastelholma (or Kastelholm) castle is from the year 1388 in the contract of Queen Margaret I of Denmark, where a large portion of the inheritance of Bo Jonsson Grip was given to the queen. The heyday of the castle was in the 15th and 16th centuries when it was administrated by Danish and Swedish kings and stewards of the realms. Kastelhoma was expanded and enhanced several times.
In the end of 16th century castle was owned by the previous queen Catherine Jagellon (Stenbock), an enemy of the King of Sweden Eric XIV. King Eric conquered Kastelholma in 1599 and all defending officers were taken to Turku and executed. The castle was damaged under the siege and it took 30 years to renovate it.
In 1634 Åland was joined with the County of Åbo and Björneborg and Kastelholma lost its administrative status.