The exact building year of Stahleck castle is not known, but it has been proved that the castle was already occupied since the year 1095. It's first mentioned in documents in the year 1135 under Goswin von Hochstadt. Until 1148 almost 10 years of fight followed for the rights of the Stahleck.
In the year 1156, after the death of Hermann of Stahleck, his stepbrother Konrad von Hohenstaufen became count palatine of Bacharach on the Rhine river. The town of Bacharach, which is situated on the castle mountain, became center and residence of the originating palatine territory on the Rhine river. Castle Stahleck, which was originally the most farthest southern situated property of the Cologne bishops, was assigned from the emporer Barbarossa to his brother Konrad in the year 1190.
In the Thirty Years' War, in year 1644, as the Catholic party banished the French out of the town with 250 cavalries and 450 Cologne foot soldiers, these fled into the castle Stahleck. Colonel of Nievernheimb, commander on the fortress Ehrenbreitstein, let the castle Stahleck near Bacharach at the Rhine river thereupon be fired at without occupying it. Th restoration was made in 1666 by the elector count palatine Carl Ludwig.
Between January and May 1689 the Stahleck castle was exploded by the french troops from Ludwig XIV. 237 years it was in a ruins, until the crown prince of Preußen bought the area in 1828. Rhine river society accomplished restoration work in 1909 and 1910.
Starting at the end of 1965 until May 20, 1967, the youth hostel was further constructed on the castle Stahleck. Thereby the in the substructure still original roman Bergfried of the castle Stahleck with abated wall strength was newly roofed and furnished with new walls. Today it expresses the picture of a medieval castle with different construction phases and is one of the most well-known youth hostels.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.