The Kallerup Stone was discovered in 1827 by a stonemason in a field with several stone circles near a church in Hedehusene. It was then restored in 1851 by raising it near its original position. This granite runestone, which is 1.6 meters in height, is among the oldest in Denmark and is believed to date from about 700 to 800 AD. The elder futhark inscription is somewhat unusual in that it uses text bands, the inscribed lines above and below the runic text, which is a practice that did not become common on runestones until later with the use of the younger futhark. The Kallerup Stone is classified as being carved in runestone style RAK, which is considered to be the oldest classification. This is the classification for inscriptions where the ends of the runic text bands are straight and without any attached dragon or serpent heads. In the runic inscription, the name Hornbora translates as 'horn-bearer'.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.