The parish church dedicated to St. Dorothy was probably erected by the end of the 15th century. In the end of the 16th century a bell tower was added to the nave. It was renovated and partially transformed at the beginning of the 19th and 20th centuries. The interior is decorated with a renaissance polychrome from the mid 16th century and with a mannerist one form the mid-17th century. The chapel is among the oldest of the corner joining wooden churches.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.