There are few remnants of those earliest buildings and there are no known surviving records of the construction of the 13th century church, so historians have used the remains of the architecture to date the ruins. It is one of the most remarkable remains of Celtic art and medieval architecture in Ireland.
There are arcades on the exterior and the interior of the chapel and it has a barrel-vaulted ceiling where various heads peer down at you, it also has a two carved tympanums (a semi-circular or triangular decorative wall surface over an entrance). The chapel also contains one of the best preserved Irish frescoes from this time period.