Down Cathedral location is an ancient ecclesiastical site dedicated to the Holy Trinity recorded in the 12th century. In 1124 St Malachy became Bishop of Down, and set about repairing and enlarging the Cathedral. In 1177, Sir John de Courcy (Norman conqueror of Ulster) brought in Benedictine monks and expelled Augustinian monks settled there by St Malachy. De Courcy, who had enraged the king by his seizure of lands in Ireland beyond what he was granted, was taken prison there on Good Friday 1204. According to the account, the unarmed de Courcy managed to take a weapon from one of his attackers and killed 13 men before being overpowered and taken prisoner.
By 1220, this building was in ruins and was further damaged by an earthquake in 1245. The Cathedral was burned down by Edward Bruce in 1315 and subsequently rebuilt and destroyed several times. In 1538 the monastery was suppressed and then destroyed in 1539 by Lord Leonard Grey, the Lord Deputy of Ireland, who stabled horses there. The destruction of the Cathedral was one of the charges for which Grey was executed in 1541. For two centuries after that it lay in ruins. In 1778 John Wesley, the founder of Methodism, visited and described it as a noble ruin. A Round Tower close to the Cathedral was taken down in 1790.
The cathedral incorporates parts of the 13th-century church of the Benedictine Abbey of Down.
The restoration of the ruined 14th century cathedral of Downpatrick was initiated after an Act of Parliament of 1790. The long chancel from the late medieval cathedral was repaired and transformed into an aisled nave and chancel for the new cathedral. Charles Lilly directed the restoration, but it was so drastic that many details of the original building disappeared, as he aimed at reproducing an overall medieval effect. Work was completed and the cathedral was ready for use in 1818. An octagonal vestibule and a Perpendicular Gothic tower were added to the west end in 1826.
Crosses from the 9th, 10th and 12th centuries are preserved in the Cathedral. The building today is mainly the original chancel from the 15th century with a vestibule and tower added. It had a second major restoration from 1985 to 1987 during which time the Cathedral was closed.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.