Lewis’ Topographical Dictionary comprises of several counties, cities, boroughs, parish and villages – with historical and statistical descriptions – of Ireland. Here are From-Ireland.net’s records for Co. Mayo.
ContentKILLASSER, a parish, in the barony of GALLEN, county of MAYO, and province of CONNAUGHT, 6 miles (E.N.E.) from Foxford, on the river Moy and the road to Swinford; containing 6,581 inhabitants.
This parish was the scene of a sanguinary battle between the native septs of the Jordans and the Rowans, at a spot since called Lugnafulla, or "the valley of blood." It comprises 10,000 statute acres, of which about 6,000 are arable and the remainder principally bog and mountain; the land is of indifferent quality and is in many places covered with rocks of great size; some of the eastern portion is more productive, but agriculture is in a very backward state; there is a large tract of irreclaimable bog.
It is a vicarage, in the diocese of Achonry, forming part of the union of Templemore; the rectory is impropriate in the representatives of the late Roger Palmer, Esq. The tithes amount to £512.0s.4d., which is equally divided between the impropriator and the vicar.
In the Roman Catholic divisions it forms a separate benefice; there are two chapels, situated respectively at Calla and Boullabee, both well built and roofed with slate. About 90 children are taught in a public school; and there are five private schools, in which are about 450 children.
There are several Danish forts in the western portion of the parish; at Calla is a small lake, in which is an island presenting appearances of fortifications, said to have been inhabited by the sept of the Rowans; at Erbull are the ruins of an old castle; and there are ancient burial-places at Killasser, Blackpatch, and Calla.