St. George's Abbey in Isny is a former Benedictine abbey founded in 1096 by the Counts of Altshausen-Veringen. In 1106 the foundation was confirmed by Pope Paschal II. Towards the end of the 12th century a Benedictine nunnery was also established in Isny but this was moved in about 1189 to Rohrdorf.
St. George's Abbey was responsible for the foundation of the town of Isny, which was developed as a market at the end of the 12th century and received municipal status as early as 1235. Both abbey and town enjoyed economic success, abruptly terminated by the plague in 1350, which almost wiped the abbey out.
During the Reformation the town of Isny became Protestant and in 1534 the abbey church was attacked and its sacred images destroyed. The abbey's economic situation only improved — temporarily — in the first third of the 17th century, which was brought to an end by a disastrous fire in 1631. The abbey did not recover until the time of abbot Alfons Torelli (1701–31). It did not become an Imperial abbey until 1781, as member of the Bench of Swabian Prelates.
The abbey was secularised in 1803, at the same time as the town of Isny was mediatised, when both became part of the territory of Count Otto Wilhelm von Quadt-Wykradt.
The first monastic buildings and the Romanesque abbey church burnt down in 1284. Immediately after the fire a hall church was constructed, which was dedicated in 1288. In the relatively brief period of prosperity that occurred in the first third of the 17th century much refurbishment and new building work took place, all of which were destroyed by the catastrophic fire in 1631. In about 1656 Michael Beer built the Baroque Neue Bau ('new building') and also repaired parts of the ruins of the former buildings.
The present abbey church was built by Giulio Barbieri between 1660 and 1666; the onion dome was added in 1709. In 1757-58 Johann Georg Gilt (of the Wessobrunner School of stuccoists) and Johann Michael Holzhey refurbished the church interior in the Rococo style.
After secularisation the monastic buildings served as the castle of the count and family. During the Third Reich it accommmodated the Hitler Youth until 1943. The premises were later used as an old people's home and nursing home.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.