The Château d'Aurignac was built on a hill before 1240 by Bernard V, Counts of Comminges, and the village developed around it. Henry IV ordered the destruction of the castle in the early 17th century and, although it was still partly inhabited in 1627, it fell into disuse not long afterwards. All that remains today are the church, a well-restored keep on the peak of the hill and some of the ramparts, which have been incorporated into houses.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.