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:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.