And so indeed it was. But St. Cailin of Fenagh had told them to guard it well, and above all to see that it never fell into the hands of the foreigner, for that day would work woe for Erin and confusion to the O'Donnells. Thus it became the most precious treasure of the Clan-Conal, and not a man of them that was not ready to die in its defence on the field of battle. Moreover, they appointed as hereditary guardians of the Cathach, the family of McRobartaigh--now McGroarty--and assigned for their maintenance the lands still called from them Ballymacgroarty, in the parish of Drumhome, county Donegal. The casket, or _cumdach_, in which this treasure was contained, bears an inscription in Irish on three sides to this effect:--"Pray for Cathbarr O'Donnell for whom this casket was made, and for Sitric, son of Mac Aedha, who made it, and for Domnall MacRobartaigh (abbot) of Kells at whose house it was made." The casket itself is of the most exquisite workmanship, and this inscription proves that it was made at the expense of Cathbarr O'Donnell, chief of his name in Donegal about the end of the eleventh century--he died in A.D. 1106. It was made, however, in the Abbey of Kells, which had been founded by Columcille, and was then ruled by a member of that very family of McGroarty, who were the hereditary custodians of the Cathach. The McGroartys were more faithful to their trust than the McMoyres, who had the custody of the _Book of Armagh_, and several members of the family met their death in defence of their sacred charge. In A.D. 1497 Con O'Donnell led an army against McDermott of Moylurg; but he and his troops were defeated, and "the Cathach of Columcille was also taken from them, and McGroarty, the keeper of it, was slain." It was restored, however, two years later. Again, in A.D. 1567, McGroarty, the keeper of the Cathach, was slain in a fratricidal conflict between the O'Donnells and O'Neills on the shore of Lough Swilly. In A.D. 1647, when John Colgan wrote, it was still, he tells us, in his own native county of Donegal. Daniel O'Donnell, who fought well for King James, carried it with him to the Continent, and had a new rim fixed on the casket with his name and the date, A.D. 1723. He died in A.D. 1735, leaving this precious relic on the Continent, where it remained until 1802, when it was claimed and recovered by Sir Neal O'Donnell of Newport in the county Mayo, from whom it passed to its present owner, Sir Richard O'Donnell.