Tarbert Castle was a strategic Royal stronghold during the Middle Ages. The castle overlooks the harbour and has a very commanding view of the water approaches. In 1320 Robert the Bruce protect it against the Lords of the Isles.
This single chambered chapel is typical of churches in the West Highlands in the Early 13th Century. The chapel also contains a collection of late Mediaeval grave slabs recovered from the churchyard, and a 7th Century cross.