Schlehdorf Abbey was originally a Benedictine monastery, later an Augustinian monastery, and is today a convent of the Missionary Dominican Sisters of King William's Town.
The abbey, dedicated to Saints Dionysius and Tertullinus, was founded around perhaps 740 from the nearby Benediktbeuern Abbey. In 769 it was resettled by monks from the abandoned Scharnitz Abbey. The first abbot, Atto, brought with him the relics of Saint Tertullinus. It was a Benedictine monastery until the 9th century, after which it is heard of no more; presumably it was destroyed during the Hungarian invasions. From 1140 it was revived as a house of the Augustinian Canons.
In 1803 it was dissolved during the secularisation of Bavaria, and sold off. Since 1904 Schlehdorf has belonged to the Missionary Dominican Sisters of King William's Town. It has been the seat of the German Province of the Order since 1960, and as of 2010 is a community of about 60 Dominican sisters. In the abbey grounds, besides a guesthouse and the abbey shop, is a girls' secondary school of the diocese of Munich and Freising.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.