The present Dromore Cathedral was originally constructed in 1661 by Jeremy Taylor, Bishop of Down and Connor and has been several times expanded to its present size.
The first church on the site was a wattle and daub building constructed by St Colman circa 510. This was replaced by a medieval church which was destroyed in the late 16th century. The church was again rebuilt and in 1609 elevated to the 'Cathedral Church of Christ the Redeemer' by Letters Patent of James I. In 1641 this building, too, was destroyed.
The present building was first constructed under Bishop Jeremy Taylor in 1661 as a narrow church 100 feet (30 metres) long. In 1811 Thomas Percy (bishop of Dromore) added a short aisle at right angles to the nave to form an L-shaped floor plan. In 1870 a semicircular sanctuary and organ aisle were added. Finally in 1899 an additional aisle parallel to the original nave aisle was added to achieve a conventional rectangular floor plan.
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.