The complex of the Holy Spirit church and adjacent monastery was established in 1567. The construction was ordered by the King of Lithuania-Poland Wladyslaw Vasa. By the end of the 16th century, a monastery, a school and a printing shop were situated next to the church. In 1749 the church was badly damaged by fire.
After the reconstruction between 1749-1753 (made by architect January Kristof Glaubic) the church became the only Baroque style Orthodox sanctuary in Lithuania. The interior was crowned by a wooden iconostas resembling the Catholic altar, under which a crypt was built for the relics of Orthodox saints Anthony, John and Eustatius. In 1853 the relics were relocated to a new reliquary. The last reconstruction of the church was accomplished on the initiative of N. Muravyov. The monastery complex comprises two monasteries: the friary of Holy Spirit (built at the intersection in the 15th and 16th centuries) and the convent of Holy Mary Magdalene (built in the late 16th century). Both buildings (reconstructed in the 19th century) have Gothic fragments.
Today Holy Spirit church is the main Orthodox Church in Lithuania. The male and female monasteries next to the church are the only working Orthodox monasteries in Lithuania.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.