This Roman Catholic house of worship was designed and built during the late 18th century, a particularly difficult and turbulent period for the religion in Irish history. It is widely known as the oldest Roman Catholic Cathedral in Ireland and the only one that is decidedly Baroque in style. It is an elegant and ornate structure, complete with vaulted ceilings, ornamental pillars, and the added embellishment of authentic Waterford Crystal chandeliers. The architect of Holy Trinity Cathedral, John Roberts, also designed a sister church for protestant worshippers nicknamed Christ Church. He was responsible for the design of most of the structures built in Waterford City during his life span (1714-96). He was also the father of 22 children.