Hogrän Church consists of a Romanesque tower and a Gothic nave and choir. The tower thus is the oldest part of the church, dating from circa 1200. Attached to it was originally an earlier stone church, also Romanesque in style and erected during the 12th century. During the 14th century, it was however replaced by the presently visible Gothic nave and choir. A few details from this earlier church, such as a few sculpted reliefs and a Romanesque window-frame, have been incorporated in the Gothic church.
The interior of the church is characterised by the broad width of the nave (10 metres). The church contains a number of medieval items. The triumphal cross is one of the oldest wooden sculptures from Gotland, dating from the 12th century. The finely carved doors of the tabernacle are from the early 15th century, and the door of the sacristy is likewise medieval. The baptismal font, probably a work by the craftsman or workshop known as Master Byzantios, is from the late 12th century. Of later date are the altarpiece (1634), the pulpit (1637) and the choir stalls (17th century but with incorporated medieval elements).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.