This cathedral was dedicated to Our Lady Assumed into Heaven and to St. Nicholas. It was designed by John J. Robinson in 1957 and made from black marble from Galway, a local stone that can be polished beautifully. In the east transept above the altar in St. Nicholas' chapel there are outstanding early 17C carved stone plaques depicting the Trinity around the Virgin Mary. These had been saved from St. Nicholas' Church dating back to the times of Cromwell.