Achad Finglass Abbey (Walsh)

The following is from Fr. Thomas Walsh's History of the Irish Hierarchy, published in New York in 1854, chapter xxxvii, at p. 366:

Achad Finglass This abbey was situated near Leighlin on the east of the river Barrow in the district of Idrone the precise time of its erection is not known St Fintan of Clonenagh may have been the founder This abbey was one of note in the year 864 as the Danes then pillaged it St Aidus was abbot of this monastery The festival of this saint is observed on the 11th of April St Fintan having been at Achad Finglass advised a bishop Brandubh who applied for admission into the monastery of Clonenagh to remain where he was as the rule was less severe.