Synod of Kells of Dublin and Tuam to archdioceses. The four provinces of Armagh, Cashel, Dublin and Tuam corresponded to the contemporary boundaries of the provinces of Ulster, Munster, Leinster and Connacht respectively. The diocesan structure established by the synod largely survived until the sixteenth century, and still forms the basis of the territorial structure of both the Catholic Church and the Church of Ireland, with many of the sees now merged. Synod of Kells The Synod of Kells took place in AD 1152, under the presidency of His Eminence Giovanni Cardinal Paparoni, and continued the process begun at the Synod of Ráth
Book of Kells the book as "of Columkille"—that is, having belonged to, and perhaps being made by Columba—suggests that the book was believed at that time to have been made on Iona. Regardless, the book was certainly at Kells in the 12th century, when land charters pertaining to the Abbey of Kells were copied onto some of its blank pages. The practice of copying of charters into important books was widespread in the medieval period, and such inscriptions in the Book of Kells provide concrete evidence about its location at the time. The Abbey of Kells was dissolved due to the ecclesiastical reforms