The See of Dromore was founded in the sixth century by Colman of Dromore, and had its own independent jurisdiction ever since. The old cathedral of Dromore, which had been taken by the Protestants, was burnt down by the Irish insurgents in 1641, and rebuilt by Bishop Taylor twenty years later; the Catholic Church was erected later. In 1750 the seat of the cathedral was transferred to Newry the largest town of County Down situated at the head of Carlingford Lough.
Newry Cathedral, dedicated under the joint patronage of St Patrick & St Colman, was designed by the city's greatest native architect Thomas Duff and work began in 1825 with the basic building completed in 1829. Built of local granite, it was the first Catholic Cathedral in Ireland opened after Catholic Emancipation.
Work continued to enlarge and beautify the Cathedral at various stages in the late nineteenth and early twentieth century viz. the tower and transept were added in 1888 and the nave extended in 1904 under the supervision of Bishop Henry O'Neill.
The Cathedral replaced St Mary’s Church (the Old Chapel) which has been constructed by Bishop Lennon in 1789 and which, for forty years, doubled as both a parish Church and quasi-cathedral, two bishops having received episcopal consecration there.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.