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
Abbey of Kells in the "Annals of Ulster" is generally believed to refer the theft of the Book of Kells and it relates that the manuscript was returned after two months without its cover. The force of the removal of the cover probably explains the missing illustrations at the beginning and end of the book. The book was stored in the abbey for the remainder of the Middle Ages. In the 12th century, details of land charters for the abbey were copied onto blank pages of the Book of Kells as was common practice for the period. This is the earliest confirmed reference