"Do rádh Murchadh deagh-mhac Bhriain
Air na mhárach, 's níor chiall uaidh
Uiriod a bhfuairís aréir
Geabhair uaim féin's ni air th-fhuath."
[24] Charles O'Conor ascribes it to him, but neither Keating, the "Four Masters," nor Colgan, who all make use of it, mention a word about the author.
[25] In the "Master of the Rolls" Series, in 1867. "That the work was compiled from contemporary materials," says Dr. Todd, "may be proved by curious incidental evidence. It is stated in the account given of the Battle of Clontarf that the full tide in Dublin Bay on the day of the battle (23rd April, 1014) coincided with sunrise, and that the returning tide at evening aided considerably in the defeat of the enemy. It occurred to the editor, on considering this passage, that a criterion might be derived from it to test the truth of the narrative and of the date assigned by the Irish Annals to the Battle of Clontarf. He therefore proposed to the Rev. Samuel Haughton, M.D., Fellow of Trinity College, and Professor of Geology in the University of Dublin, to solve for him this problem: 'What was the hour of high water at the shore of Clontarf in Dublin Bay on the 23rd of April, 1014.' The editor did not make known to Dr. Haughton the object he had in view in this question, and the coincidence of the result obtained with the ancient narrative is therefore the more valuable and curious."
Dr. Haughton read a paper on the mathematics of this complex and difficult question before the Royal Irish Academy, in May, 1861, in which he proved that the tide—a neap tide—was full along the Clontarf shore at about 5h. 30m. a.m., and that the evening tide was full in about 5h. 55m. p.m. "The truth of the narrative," says Dr. Todd, "is thus most strikingly established. In the month of April the sun rises at from 5h. 30m. to 4h.30m. The full tide in the morning therefore coincided nearly with sunrise; a fact which holds a most important place in the history of the battle, and proves that our author if not himself an eye-witness, must have derived his information from those who were. 'None others,' as Dr. Haughton observes, 'would have invented the fact that the battle began at sunrise and that the tide was then full in. The importance of the time of tide became evident at the close of the day, when the returned tide prevented the escape of the Danes from the Clontarf shore to the north bank of the Liffey.'"
[26] An ancient Irish missal preserved in the Bodleian contains this petition for the Irish king and his army, in its Litany for Easter Eve: "Ut regem Hibernensium et exercitum ejus conservare digneris—ut eis vitam et sanctitatem atque victoriam dones." If this missal is posterior to 1014 it must have been the reminiscence of Clontarf which inspired the prayer for the day following the battle. If the missal is older than the battle, then the coincidence is curious. The prayer was just a day late. The same missal mentions in its Litanies the names Patrick, Brendan, Brigit, Columba, Finnian, Ciaran, and St. Fursa, and contains collect, secret and post communion pro rege [for the Irish king].
[27] Evidently the interpolation of a copyist.
[28] The family banshee of the Royal house of Munster.
[29] In Irish, Donnchadh, pronounced "Dunnăχa," as Murchadh is pronounced "Murrăχa," in English Murrough.
[30] It is edited from the Book of Leinster, a MS. which was copied about 1150, which contains the first 28 chapters, from a vellum of about two centuries later, which wants five chapters at the beginning and eight at the end, and from a perfect transcript made by the indefatigable Brother Michael O'Clery in 1635 "out of the book of Cuconnacht O'Daly," who died according to the "Four Masters," in 1139.
[31] I.e., Beside his fairy lover. This incident is greatly expanded in the modern MS. story of the Battle of Clontarf, of which there exist numerous copies; in these the gliding of history into romance is very apparent. In the modern version the fairy Aoibheall is introduced begging O'Hartigan not to fight and promising him life and happiness for two hundred years if he will put off fighting for only one day.