In 1192, John Comyn, first Anglo-Norman archbishop of Dublin, elevated one of the four Dublin Celtic parish churches, this one dedicated to Saint Patrick, beside a holy well of the same name and on an island between two branches of the River Poddle, to the status of a collegiate church, i.e., a church with a body of clergy devoted to both worship and learning.
The new collegiate church fell outside the city boundaries, and this move created two new civic territories, one under the archbishop's temporal jurisdiction.
The church was dedicated to "God, our Blessed Lady Mary and St Patrick" on 17 March 1191.

Comyn's charter of 1191 or 1192, which allowed for a chapter of thirteen canons, of which three held special dignities (as chancellor, precentor and treasurer), was confirmed by a papal bull (of Pope Celestine III) within a year.
The thirteen prebendaries attached to the church were provided with archepiscopal lands.

Over time, a whole complex of buildings arose in the vicinity of the cathedral, including the Palace of the St Sepulchre (seat of the archbishop), and legal jurisdiction was divided between a Liberty controlled by the dean, around the cathedral, and a larger one belonging to the archbishop, adjacent.

While it is not clear when precisely the church was further raised to the status of cathedral, a unique move in a city with an existing cathedral, it was probably after 1192, and Comyn's successor as Archbishop, Henry de Loundres, was elected in 1212 by the chapters of both Christ Church and St Patrick's, this election being recognised by Pope Innocent III.
See below for more on the question of status.
Henry granted a number of further charters to the cathedral and chapter between 1218 and 1220, and one of these in 1220 created the office of dean to head the cathedral, the right of election being allocated solely to the canons of the Chapter.

The basis of the present building, as noted, the largest church in Ireland, was built between 1191 and 1270, though little now remains of the earliest work beyond the baptistry.
Much of the work was overseen by the previously mentioned Henry of London, a friend of the King of England and signatory of the Magna Carta, who was also involved in the construction of Dublin's city walls, and Dublin Castle.

An order from King Henry III in 1225 allowed the collection of donations from across the island for reconstruction for a period of four years, and the work, in the Early English Gothic style, lasted at least until rededication in 1254.
The Lady Chapel was added around 1270.

In 1300, Archbishop Ferings of Dublin arranged an agreement between the two cathedrals, the Pacis Compositio, which acknowledged both as cathedrals and made some provision to accommodate their shared status.
For more, see Status below.

In 1311 the Medieval University of Dublin was founded here with William de Rodyard, Dean of St Patrick's, as its first Chancellor, and the Canons as its members.
It never flourished, and was suppressed at the Reformation.

From the mid-14th century, and for over 500 years, the north transept of the building was used as the parish church of St Nicholas Without (i.e. the part of the Parish of St Nicholas outside the city proper).

The tower (Minot's Tower) and west nave were rebuilt between 1362 and 1370, following a fire.
The name commemorates Thomas Minot, Archbishop of Dublin 1363–75, who oversaw the rebuilding.

From the very earliest years there were problems with seepage of water, with a number of floods, especially in the later years of the 18th century, caused by the surrounding branches of the River Poddle – even in the 20th century, it is reported that the water table was within 2.3 metres (7.5 feet) of the floor.
This situation ensured there would never be a crypt or basement area.
In 1192, John Comyn, first Anglo-Norman archbishop of Dublin, elevated one of the four Dublin Celtic parish churches, this one dedicated to Saint Patrick, beside a holy well of the same name and on an island between two branches of the River Poddle, to the status of a collegiate church, i.e., a church with a body of clergy devoted to both worship and learning. The new collegiate church fell outside the city boundaries, and this move created two new civic territories, one under the archbishop's temporal jurisdiction. The church was dedicated to "God, our Blessed Lady Mary and St Patrick" on 17 March 1191.
Comyn's charter of 1191 or 1192, which allowed for a chapter of thirteen canons, of which three held special dignities (as chancellor, precentor and treasurer), was confirmed by a papal bull (of Pope Celestine III) within a year. The thirteen prebendaries attached to the church were provided with archepiscopal lands.
Over time, a whole complex of buildings arose in the vicinity of the cathedral, including the Palace of the St Sepulchre (seat of the archbishop), and legal jurisdiction was divided between a Liberty controlled by the dean, around the cathedral, and a larger one belonging to the archbishop, adjacent.
While it is not clear when precisely the church was further raised to the status of cathedral, a unique move in a city with an existing cathedral, it was probably after 1192, and Comyn's successor as Archbishop, Henry de Loundres, was elected in 1212 by the chapters of both Christ Church and St Patrick's, this election being recognised by Pope Innocent III. See below for more on the question of status. Henry granted a number of further charters to the cathedral and chapter between 1218 and 1220, and one of these in 1220 created the office of dean to head the cathedral, the right of election being allocated solely to the canons of the Chapter.
The basis of the present building, as noted, the largest church in Ireland, was built between 1191 and 1270, though little now remains of the earliest work beyond the baptistry. Much of the work was overseen by the previously mentioned Henry of London, a friend of the King of England and signatory of the Magna Carta, who was also involved in the construction of Dublin's city walls, and Dublin Castle.
An order from King Henry III in 1225 allowed the collection of donations from across the island for reconstruction for a period of four years, and the work, in the Early English Gothic style, lasted at least until rededication in 1254. The Lady Chapel was added around 1270.
In 1300, Archbishop Ferings of Dublin arranged an agreement between the two cathedrals, the Pacis Compositio, which acknowledged both as cathedrals and made some provision to accommodate their shared status. For more, see Status below.
In 1311 the Medieval University of Dublin was founded here with William de Rodyard, Dean of St Patrick's, as its first Chancellor, and the Canons as its members. It never flourished, and was suppressed at the Reformation.
From the mid-14th century, and for over 500 years, the north transept of the building was used as the parish church of St Nicholas Without (i.e. the part of the Parish of St Nicholas outside the city proper).
The tower (Minot's Tower) and west nave were rebuilt between 1362 and 1370, following a fire. The name commemorates Thomas Minot, Archbishop of Dublin 1363–75, who oversaw the rebuilding.
From the very earliest years there were problems with seepage of water, with a number of floods, especially in the later years of the 18th century, caused by the surrounding branches of the River Poddle – even in the 20th century, it is reported that the water table was within 2.3 metres (7.5 feet) of the floor. This situation ensured there would never be a crypt or basement area.
St Patrick's Cathedral, Dublin