In his letters Lanfranc insists much upon Catholic unity. According to modern ideas, the heaviest of the charges which he brings against the Irish Church is the levity with which they regarded the marriage tie. It appears that men even exchanged wives. Bishop Patrick promised ecclesiastical fealty to the Archbishop of Canterbury, as Primate of the British Isles. Lanfranc had obeyed the order of his old pupil Alexander II., who was prompted by the deacon Hildebrand, and had gone to Rome to receive his pall. But in his dealings with Dublin he acted independently, and he was ready to give advice to Irish prelates, though without claiming direct jurisdiction over them. In doctrinal matters he was an ally of Rome. Himself an Italian, he espoused the dogma of transubstantiation in opposition to the Irishman Erigena, and the Frenchman Berengarius; and on the great question of clerical celibacy he was a follower, though not an extreme one, of the uncompromising Hildebrand. The ever-watchful Roman Court probably espied the germ of a Western patriarchate, and was thus moved to annex Armagh as a counterpoise to the dangerous primacy claimed under a grant of Gregory the Great by the successors of Augustine. Gregory VII., in addressing the kings, nobles, and prelates of Ireland, took care to claim absolute sovereignty by divine right; and here he ran little risk of such a rebuff as William the Conqueror administered.[26] [Sidenote: Lanfranc and Anselm.] Patrick's successor was Donat O'Haingly, an Irishman, but a Benedictine monk of Canterbury, who was consecrated by Lanfranc, to whom he had been recommended by King Tirlogh. He was succeeded by his nephew Samuel, a Benedictine of St. Albans, who was consecrated by Anselm. That great archbishop was not altogether pleased with his Irish brother, whom he chid for alienating vestments bestowed on the Church of Dublin by Lanfranc, and for having the cross borne before him, although he had never received the pall. A further element of confusion was introduced, probably in 1118, by the Irish synod of Rathbreasil, which declared Dublin to be in the diocese of Glendalough; and it seems that the Irish inhabitants submitted, while those of Danish origin refused to do so. [Sidenote: Ralph of Canterbury consecrates Gregory, who receives the pall from Pope Eugenius.]