Synod of Kells

The Synod of Kells took place in AD 1152, under the presidency of Cardinal Paparoni, and continued the process begun at the Synod of Rathbreasail of reforming the Irish church. The sessions were divided between the abbeys of Kells and Mellifont, and in later times the synod has been called the Synod of Kells-Mellifont and the Synod of Mellifont-Kells.

Its main effect was to increase the number of archbishops from two to four, and to redefine the number and size of dioceses. The Primacy of Ireland was granted to the Archdiocese of Armagh.

Máel Máedóc Ua Morgair (Saint Malachy) was made a priest in 1119, as vicar to Celsus. His first sees were Down and Connor, and he was located at Bangor Abbey. On the death of Celsus in 1129, Malachy was nominated as his successor at Armagh, now the prime see in Ireland. An internal church dispute over the succession and proposals for reform obliged him to concede the position to Gelasius. In 1137, Gelasius, lacking papal confirmation of the appointment of Malachy by Rome asked him to secure the archbishop's pallium at the hands of the Pope or his legate. Malachy reached Rome but the Pope, Innocent II, would only grant the pallia to Malachy at the request of an Irish National Synod. To facilitate this, he made Malachy his papal legate. Malachy then returned to Ireland accompanied by a number of Cistercian monks provided by St. Bernard.

...
Wikipedia