The history of the Sjundby manor castle dates back to year 1417. The present main building was built in the 1560’s by Jakob Henriksson. It was made of grey stone and had also a defensive purpose. Sjundby has been a residence for several noble families. The most well-known owner was Sigfrid Wasa, the daugher of the king Eric XIV. After her Adlercreutz family had owned Sjundby over 300 years to the present. Only exception was in 1944-1956, when the Porkkala area was rent to Russians and used as a garrison.
Sjundby is one of the finest stone buildings in Finland. The castle is in private possession but is also open to visitors (contact firstname.lastname@example.org).
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.