There is almost no precedent for a two-cathedral city, and some believe it was intended that St Patrick's, a secular (diocesan clergy who are not members of a religious order, i.e. under a rule and, therefore, "regular") cathedral, would replace Christ Church, a cathedral managed by an order.

A confrontational situation persisted, with considerable tension, over the decades after the establishment of St Patrick's, and was eventually settled, more-or-less, by the signing of a six-point agreement of 1300, Pacis Compositio.
Still extant, and in force until 1870, it provided that:
The consecration and enthronement of the Archbishop of Dublin was to take place at Christ Church – records show that this provision was not always followed, with many archbishops enthroned in both, and at least two in Saint Patrick's only
Christ Church had formal precedence, as the mother and senior cathedral of the diocese
Christ Church was to retain the cross, mitre and ring of each deceased Archbishop of Dublin
Deceased Archbishops of Dublin were to be buried alternately in each of the two cathedrals, unless they personally willed otherwise
The annual consecration of chrism oil for the diocese was to take place at Christ Church
The two cathedrals were to act as one, and shared equally in their freedoms.

Over the following centuries, the two cathedrals functioned together in the diocese, until in the period of disestablishment of the Church of Ireland, the current designation of one as the cathedral of Dublin and Glendalough, and one as the national cathedral, was developed.
There is almost no precedent for a two-cathedral city, and some believe it was intended that St Patrick's, a secular (diocesan clergy who are not members of a religious order, i.e. under a rule and, therefore, "regular") cathedral, would replace Christ Church, a cathedral managed by an order.
A confrontational situation persisted, with considerable tension, over the decades after the establishment of St Patrick's, and was eventually settled, more-or-less, by the signing of a six-point agreement of 1300, Pacis Compositio. Still extant, and in force until 1870, it provided that:
The consecration and enthronement of the Archbishop of Dublin was to take place at Christ Church – records show that this provision was not always followed, with many archbishops enthroned in both, and at least two in Saint Patrick's only
Christ Church had formal precedence, as the mother and senior cathedral of the diocese
Christ Church was to retain the cross, mitre and ring of each deceased Archbishop of Dublin
Deceased Archbishops of Dublin were to be buried alternately in each of the two cathedrals, unless they personally willed otherwise
The annual consecration of chrism oil for the diocese was to take place at Christ Church
The two cathedrals were to act as one, and shared equally in their freedoms.
Over the following centuries, the two cathedrals functioned together in the diocese, until in the period of disestablishment of the Church of Ireland, the current designation of one as the cathedral of Dublin and Glendalough, and one as the national cathedral, was developed.
St Patrick's Cathedral, Dublin