Consecrated in the 11th century, the San Giovanni del Toro church was restored in 1715 after damage caused by an earthquake, and it was restored again in the 1990s. The church is named for John the Apostle and for 'Il Toro', the former name of the old aristocratic quarter in which it was built. It is especially noted for its pulpit, dating from around the 13th century.
The pulpit is notable for its mosaics, the decorative patterns of which inspired the interlocking patterns used by M.C. Escher, who spent time in Ravello in the 1920s and studied the church and the pulpit; Ravello was one of his favorite places. One mosaic is of Jonahe merging from the whale. An eagle supports the reading desk, and it holds a book opened to the first sentence of the Gospel of John. The 'beautiful' pulpit, which dates from the time of Roger I of Sicily, also contains Oriental pottery and Arabic script, and the steps up to it contain well-preserved frescoes with scenes from the life of Christ. There is a side chapel with a stucco figure of Saint Catherine and her wheel.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.