Situated in the port of Pornic, Château de Pornic has long been a symbol of the town. The castle is privately owned and not open to the public. The castle is bordered on one side by the sea and is constructed on a defensive site. In the Middle Ages, it provided for the defence of the port.
In the 10th century, Alan Wrybeard, Duke of Britanny, built and fortified a wooden castle. It was occupied by a garrison who protected the entrance to Pornic. In the 12th century, it was the property of the Lords of Rais who rebuilt it in stone. In the 15th century, it belonged to Gilles de Rais but was confiscated by the Duke of Britanny at the time of his trial. In the 18th century, it belonged to Marquis de Brie Serrant whose properties were confiscated during the French Revolution. The castle fell into ruin. The castle was bought at the end of the 19th century by Monsieur Lebreton, founder of the seawater baths, and restored by the architect François Bougoüin who gave it its present appearance with its fully arched windows dressed in brick in the style of the Italian architecture of the Château de Clisson.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.