Muirchu belonged to that part of Ireland which had conformed to Roman usage since c. A.D. 634, and in this interest he took part in Adamnan’s Synod which brought about the conformity of the north. It would indeed be erroneous to suppose that these facts are required to explain the expression which he uses of the Roman see (_caput omnium ecclesiarum totius mundi_)—an expression which he might readily have used even if he had been an adherent of the Celtic celebration of Easter. But it may be asked whether the Life which Muirchu wrote at the wish of Aed had any tendency beyond its mere hagiographical interest. There is, I think, some reason for supposing that it had a particular motive. When Muirchu wrote, the church of Slébte had just been brought into close connexion with Armagh. The record stands thus in the _Liber Armachanus_ (fol. 18, rᵒ b; p. 346 Rolls ed.), as translated by Stokes:— Bishop Aed was in Slébte. He went to Armagh. He brought a bequest to Segéne of Armagh. Segéne gave another bequest to Aed, and Aed offered a bequest and his kin and his church to Patrick for ever. We cannot hesitate to bring this visit of Aed to Armagh, and his dedication of Slébte to Patrick, into connexion with the Muirchu to undertake the biography. So much seems clear. It is another question what was the motive of policy which drew interest which he evinced in Patrick’s life, when he stimulated Aed so closely to Armagh; and it is yet another whether we can discover any reflexion of such a motive in Muirchu’s work. Segéne, the abbot of Armagh, died in A.D. 688,[310] so that Aed’s visit must have occurred before that date. During the penultimate decade of the century many must have been trying to prepare the way for bringing about uniformity between northern and southern Ireland, by inducing the north to accept the Roman usages which had, more than a generation ago, been accepted by the south. It is a reasonable conjecture that Aed, who took part in the Synod which afterwards brought about this result, was working towards it in his dealings with Armagh. And it certainly is not impossible that, in giving such a prominent place in his narrative to the legend of Patrick’s first Easter in Ireland, Muirchu was thinking of the Easter controversy.[311]