 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.