So Lanfranc and Anselm schooled the O'Briens in the principles of Rome. And from one point of view their efforts were completely successful. The O'Briens became staunch friends of the Reform movement in Ireland. But from another point of view they failed. We must remember that their aim was not only to purify the Irish Church, but to bring it into subjection to Canterbury. That they did not succeed in doing. The Reformation, which they taught the O'Briens to support, meant, in the end, a repudiation of the pretensions of the English primates.

I have mentioned among those who were concerned in the election of Malchus of Waterford, O'Dunan, bishop of Meath. He is unquestionably Máel Muire Ua Dunáin, whom the annalists describe as "learned bishop of the Goidhil, and head of the clergy of Ireland, and steward of the almsdeeds of the world," and who died on Christmas Eve, 1117, at the age of seventy-six. He is mentioned in a charter in the Book of Kells, the date of which is apparently about 1100, as Senior of Leath Chuinn (_i.e._ the north of Ireland).[29] He was fifty-five when Malchus was elected, and had probably already attained the eminence throughout Ireland which is attested by the high-flown phrases of the Annals. That he was then bishop of Meath in the modern sense is impossible; the title at that period would mean no more than that he was a bishop who lived within the borders of the Kingdom of Meath. But the _Annals of Tigernach_ tell us that he died at Clonard, from which it may perhaps be inferred that his see was at that place. His importance for us just now is that he is the only adherent of the Reform movement whom we have yet discovered in the north of Ireland.

St. Bernard of Clairvaux's Life of St. Malachy of Armagh — Part 11

Before proceeding further in our investigation of the origin and course of the Reformation, it may be well to recall how far we have already advanced. We started from the fact that a Reformation of the Irish Church was actually accomplished in the twelfth century, and we proceeded to look for the causes which may have brought it about. We have found that the first of these was the revival of learning consequent on the cessation of the ravages of the Norsemen. We have noted also the restoration at the same period of communication between Ireland and the rest of Europe--the coming of students to the Irish schools, and the wanderings of Irish scholars in other lands. We have seen that the establishment of the Danish dioceses gave to the Irish a model of diocesan episcopacy, and that among the Irish-born bishops of those dioceses there were men capable of leading a Reform movement. And we have learned that Lanfranc and Anselm, through their relation with the Danish dioceses, found means to induce the more conspicuous civil and religious leaders of the Celtic population to undertake the work of reconstituting the Church. Finally, we have been able to name some persons who might be expected to take a prominent place in the early stages of the Reformation. They are Gilbert of Limerick, Malchus of Waterford, O'Dunan of Meath, and the princes of the O'Brien family. The best proof that we have rightly conceived the origin of the movement will come before us when we study the share which these persons severally had in promoting it.

St. Bernard of Clairvaux's Life of St. Malachy of Armagh — Part 11