Iona Abbey built
563 CE.
Shown on the map at 56.335°, -6.391°.
Iona Abbey is an abbey located on the island of Iona, off the larger Isle of Mull on the west coast of Scotland. It is one of the oldest Christian religious centres in Western Europe, and was a focal point for the spread of Christianity throughout Scotland. It was founded, along with its monastic community, by Saint Columba and his twelve companions in 563, when Iona was part of the Kingdom of Dál Riata. Saint Aidan served as a monk there in the 7th century before helping to re-establish Christianity in Northumberland, on the island of Lindisfarne. In the 12th century, the Macdonald lords of Clan Donald made Iona the ecclesiastical capital of the royal family of Macdonald, and subsequent Lords of the Isles into the early 16th century endowed and maintained the abbey, church and nunnery. Two of the Macdonalds (each named Angus) became Bishops of the Isles with the bishop's seat at Iona. St Oran's Chapel was the burial place for the Lords as evidenced by their grave slabs. From 1207 to 1493, the early Clan Donald and its Lords of the Isles were entirely central to Iona Abbey's medieval existence, development and prestige.
Text from the Wikipedia article Iona Abbey, licensed CC BY-SA 4.0.