An excellent example of 13th-century Gothic ecclesiastic architecture, this cathedral was spared the ravages of attackers who destroyed other Scottish worship centers. Altered in the 15th century and restored several times in the 19th and 20th centuries, it may have suffered most from neglect subsequent to the Reformation. A Jesse Tree window is in the west end of the building; and of interest are the stalls, the misericords, the pulpit with carved figures of early ecclesiastical figures, and the wooden barrel-vaulted roof with colorful armorials. A Celtic stone from about A.D. 900 is in the north aisle.