The ancient name of Boyle was _Ath dá laarg_, that is, the "ford of two forks." It is not easy to understand why such a curious name should have been given to it, for the river at Boyle, even in time of floods, is fordable, and has usually not over six or eight inches of water in it. It has, however, been proved that the rivers of Ireland, and probably of most other countries, had much more water in them in ancient times than at present. The other name for Boyle was _Búil_, whence Boyle. The word _Búil_ is entirely obsolete. It is supposed to mean handsome or beautiful. The Monastery, of which the ruins exist, was founded in 1161 by Maurice O'Duffy, a noted ecclesiastic of the period, but it is known that a smaller and more ancient monastery occupied the site on which the larger one was built at the date mentioned. Boyle Abbey was an offshoot of the great Abbey of Mellifont in the County Louth, that had been founded some twenty years before the Abbey of Boyle. Both abbeys belonged to the Cistercian order; and it would appear that so many monks flocked to Mellifont that accommodation could not be made for them all there, so the Abbey of Boyle was erected for them. The "Annals of Boyle," known also as the "Annals of Loch Cé, or Key," say that the Church of Boyle was consecrated in 1220; but that the church was built in 1161 there seems no reason to doubt. The Four Masters mention it under the year 1174. Their last mention of it is under the year 1602, and it must have been abandoned very soon after. It was granted to Sir John King in 1603, when it must have ceased to be a monastery.