Castle of Corroy-le-Château was built between 1220 and 1230 by William of Brabant, the castle is one of the best-preserved medieval buildings in Belgium, with gigantic round towers and a moat.
After some eight hundred years in the possession of the descendants of William of Brabant, the counts of Nassau-Corroy. One of the owners was Alexis of Nassau-Corroy, bastard son of Henry III of Nassau-Breda. His descendant Joseph-Ignace de Nassau, 1st Count of Corroy refurbished the castle and interior. The latest of whom to live there of their descendants is the Marquess of Trazegnies d'Ittre.
Today the castle is open to the public in summer season every Sundays.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.