Founded in a.d. 815 along the River Tay, this was converted from a church to a cathedral in 1127 by David I. It was built, damaged, and rebuilt in stages between 1452 and 1575. Its greatest destruction occurred in 1560, when the Reformers, who viewed it as a citadel of idolatry, burned the roof. Traces of the 12th-century structure clearly remain today. The choir of the ruined cathedral was renovated in the early part of the 17th century to serve as a parish church. Note the unusual windows at the triforium level. The late Gothic tower was finished in 1501. Surprisingly, it contains an elegant effigy and tomb of the so-called Wolf of Badenoch, known as the slayer of cathedrals and churches in Scotland.