The Château de Meung-sur-Loire, located next to the collegial church, was the country residence of the Bishops of Orléans. It was built and destroyed several times. The oldest still existing parts date from the 13th century and were built by Manassès de Seignelay (bishop from 1207 to 1221). Still standing are the main rectangular plan building, flanked by three towers, a fourth having been destroyed.
During the Hundred Years' War, the building was transformed into a fortress; it was taken from the English by Joan of Arc on 14 June 1429. At the end of the 15th century and start of the 16th century, building to the north incorporated a tower with drawbridge. The castle was abandoned from the Wars of Religion until the start of the 18th century, when Bishop Fleuriau d'Armenonville undertook the transformation of the structure into a comfortable residence.The rear façade was rebuilt in the Classical style by d'Armenonville. Beneath the castle are dungeons, a chapel and various medieval torture instruments, including one used for water torture.
In the middle of the 18th century, a wing was added to the southeast with a staircase serving the upper floors of the wing. In 1784, the chapel was built in the Neoclassical style, with sculpture by Delaistre. The two pavilions in the grounds are contemporary with this chapel.References:
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.