The origin of Bartoszyce Church is unknown. It was probably build on place of the castle chapel, of which we have some information from 1404, destroyed together with the castle half a century later by the inhabitants of Bartoszyce. The second medieval church in Bartoszyce, at Nowowiejskiego Street, is a simple, monolayer structure following a rectangle plan. Probably it originates from the XV century, although there are some assumptions that it could have been build already in the period of first city location. The bell tower has been added to the facade in the 19th century. The altar and pulpit supported by an angel are an example of Baroque carving of the first quarter of 18th century.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.