The cathedral was founded to supply more accommodation than the older church of St. Regulus (St. Rule) afforded. This older church, located on what became the cathedral grounds, had been built in the Romanesque style. Today, there remains the square tower, 33 metres (108 feet) high, and the quire, of very diminutive proportions. On a plan of the town from about 1531, a chancel appears, and seals affixed to the city and college charters bear representations of other buildings attached. To the east is an even older religious site, the Church of St Mary on the Rock, the Culdee house that became a Collegiate Church.