Cormac, the Prince-Bishop, began his rule over Munster in the year 900 of our common era, and passed some years in peace, after his accession. If we believe his panegyrists, the land over which he bore sway, "was filled with divine grace and worldly prosperity," and with order so unbroken, "that the cattle needed no cowherd, and the flocks no shepherd, so long as he was king." Himself an antiquary and a lover of learning, it seems but natural that "many books were written, and many schools opened," by his liberality. During this enviable interval, councillors of less pacific mood than their studious master were not wanting to stimulate his sense of kingly duty, by urging him to assert the claim of Munster to the tribute of the southern half of Erin. As an antiquary himself, Cormac must have been bred up in undoubting belief in the justice of that claim, and must have given judgment in favour of its antiquity and validity, before his accession. These _dicta_ of his own were now quoted with emphasis, and he was besought to enforce, by all the means within his reach, the learned judgments he himself had delivered. The most active advocate of a recourse to arms was Flaherty, Abbot of Scattery, in the Shannon, himself an Eugenian, and the kinsman of Cormac. After many objections, the peaceful Prince-Bishop allowed himself to be persuaded, and in the year 907 he took up his line of march, "in the fortnight of the harvest," from Cashel toward Gowran, at the head of all the armament of Munster. Lorcan, son of Lactna, and grandfather of Brian, commanded the Dalcassians, under Cormac; and Oliol, lord of Desies, and the warlike Abbot of Scattery, led on the other divisions. The monarch marched southward to meet his assailants, with his own proper troops, and the contingents of Connaught under Cathel, Prince of that Province, and those of Leinster under the lead of Kerball, their king. Both armies met at Ballaghmoon, in the southern corner of Kildare, not far from the present town of Carlow, and both fought with most heroic bravery. The Munster forces were utterly defeated; the Lords of Desies, of Fermoy, of Kinalmeaky, and of Kerry, the Abbots of Cork and Kennity, and Cormac himself, with 6,000 men, fell on the ensanguined field. The losses of the victors are not specified, but the 6,000, we may hope, included the total of the slain on both sides. Flan at once improved the opportunity of victory by advancing into Ossory, and establishing his cousin Dermid, son of Kerball, over that territory. This Dermid, who appears to have been banished by Munster intrigues, had long resided with his royal cousin, previous to the battle, from which he was probably the only one that derived any solid advantage. As to the Abbot Flaherty, the instigator of this ill-fated expedition, he escaped from the conquerors, and, safe in his island sanctuary, gave himself up for a while to penitential rigours. The worldly spirit, however, was not dead in his breast, and