Killaloe Cathedral dates from the transition between the Romanesque and Gothic periods and was completed in 1225. The front is decorated with arabesque ornaments. On the north side of the cathedral is a small oratory or chapel (8.78 X 5.33 m (28ft 9 in X 17ft 6 in) of a date earlier than the cathedral; and probably the original sanctuary of the holy man who founded the abbey (
Saint Molua (d. c 609)). Its roof is very deep, and made entirely of stone; it has a belfry, and two doorways to the east and west. In the bell tower is a chime of eight bells cast by Matthew O'Byrne of Dublin in 1896. The heaviest bell weighs just over 500 kilograms. ==Recent restoration==