Killaspugbrone is an early Christian church on the coast west of Sligo town and near the modern resort of Strandhill. One of the earliest churches in Sligo, it was founded by Bishop Brón mac Icni (d. 512) a contemporary of St. Patrick.
This church was a major pilgrimage site that contained a relic of St. Patrick known as the Fiacail Pádraig, now in the National Museum of Ireland. According to Patricks biographer Tirechán in his Collectanea, Patrick prophesied that the sea would force his heirs to move closer to the river Sligo.
The present building dates to the 12th century. The church was the victim of Viking attack, perhaps the same expedition that assaulted Inishmurray. It is the subject of an ongoing preservation initiative by the Killaspugbrone Preservation Society.
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.