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 Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.