The cathedral is dedicated to Saint Mungo, the patron saint of Glasgow, whose tomb lies at the centre of the building's Lower Church. The first stone cathedral was dedicated in 1136, in the presence of David I.[2] Fragments of this building have been found beneath the structure of the present cathedral, which was dedicated in 1197, although much of the present cathedral dates from a major rebuilding in the 13th century.[2][3] Following its foundation in 1451, the University of Glasgow held its first classes within the cathedral's chapter house.