The first date known of the settlement of Templars in Metz is 1133. Between 1180 and 1220 the Templars built an octagonal chapel in Roman style outside. The inside presented a ribbed vault and the nave opens on a square choir and on a little apse. In 1312, as happened for the large majority of Templar places, the preceptory of Metz fell to the hands of the Knights of St John of Jerusalem. In 1556, the chapel was converted in warehouse due to the building of the citadel. Now, a patted cross is still visible onto the lintel of the main door of the 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.