From Thomas Walsh's History of the Irish Hierarchy chapter lix, p. 623 ff:
Athlone, situated on the river Shannon. A market-town and parliamentary borough, rendered famous through its vigorous defence against the arms of King William III., the "Absalom" of England, and gives the title of earl to the family of Ginckle.
A Cistercian abbey was founded here, in the twelfth century, which was called de Innocentia.
A.D. 1216. King John, by a grant, dated the 30th of May, gives to this abbey four carucates of land, in the fee of Lagscueth, in exchange for the site on which he erected the castle of Athlone, and granted to the said monks the tenth of the expenses of the aforesaid castle.
A.D. 1279, King Edward I., on the 6th of June, granted to this abbey the weirs and fisheries of Athlone, and the toll of the bridge; also eight acres of arable land, at the yearly rent of £12.
A.D. 1455, died the abbot Thomas Cumin, a man celebrated for extensive knowledge and unexampled wisdom.
In the time of Queen Elizabeth, this abbey was in the possession of Sir Kichard Bingham, knight, first commissioner of Connaught, together with three chapels in the barony of Athlone, Gama, Kiltoame,
and Drayme, collectively worth 70s. Irish money.
Twentieth of Queen Elizabeth, a grant was made to Edmund O'Fallon, of Athlone, of a mill, on the water of Clonekille, in this county, and two other mills above the bridge of Athlone, with a castle on the east end of the bridge, and a small piece of land adjacent to said castle, lately built in the county of Westmeath, to hold the same at the annual rent of 12d. Irish money. And on the 5th of August preceding, another royal grant was made to said Edmund, of a stone house, and two gardens tliereunto belonging, with two other houses on the south side of the said castle, and an eel-weir on the river Shannon — all parcels of the property of this abbey.
In the ninth of King James I. it was found, that a house and garden thereunto annexed, in the town of Athlone, parcel of this abbey, annual value, besides reprises, 12d., was, by a grant trom the crown, in
the possession of Edward White, late of Ballynderry, in this county.