Christianity came to the Scottish island of Iona in 563 AD when Columba founded a monastic school there. By 1,000 AD the faith had spread throughout the west coast, particularly in Cowal, with itinerant monks founding small chapels or kils. Many of these chapels were rebuilt as churches for example at Kilmodan, the chapel of Aedin, in Glendaruel.
The foundations of a small chapel and its surrounding walls can be seen just over the small hill to the south of the lay-by on the road leading from Colintraive. It is a typical Columban site set in a sheltered dell on the edge of oak woods looking out to the Kyles of Bute. To the south of the chapel is a small pool, then used as a tober-a bhaistidh or christening well.
When the chapel was built there were two, now deserted, villages nearby and the platforms on which they stood can be found on either side of the new road leading from Colintraive. Above Fiorline there are nineteen platforms over some 41 acres. The larger group, is set in the oak wooded hillside to the east of the road and has forty-four platforms spread over 115 acres. On the platforms were timber framed, circular buildings, used as houses, byres and store rooms.