The Synod of Kells took place in 1152, under the presidency of Giovanni Cardinal Paparoni, and continued the process begun at the Synod of Ráth Breasail (1111) 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.

The Archdiocese of Dublin is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church located in the eastern part of Ireland. Its archepiscopal see includes the republic's capital city – Dublin. The cathedral church of the archdiocese is St Mary's Pro-Cathedral. Dublin was formally recognised as a metropolitan province in 1152 by the Synod of Kells. Its second archbishop, Lorcán Ua Tuathail, is also its patron saint.