Description:

The cathedral was founded to supply more accommodation than the older church of St. Regulus (St. Rule) afforded. Today, there only remains the square tower.

Work began on the new cathedral in 1158 and continued for over a century. The west end was blown down in a storm and rebuilt between 1272 and 1279. The cathedral was finally completed in 1318 and featured a central tower and six turrets; of these remain two at the east and one of the two at the western extremity, rising to a height of 30 metres (100 feet). On the 5th of July it was consecrated in the presence of King Robert the Bruce, who, according to legend, rode up the aisle on his horse.

In June 1559 during the Reformation, a Protestant mob incited by the preaching of John Knox ransacked the cathedral; the interior of the building was destroyed. The cathedral fell into decline following the attack and became a source of building material for the town. By 1561 it had been abandoned and left to fall into ruin.