Aghavower, or Aghamore, a parish, in the barony of COSTELLO, county of MAYO, and province of CONNAUGHT, 4.5 miles (N) from Ballyhaunis, on the road from that place to Swinford; containing 7062 inhabitants. St Patrick is said to have erected a monastery here, for his disciple St Loarn.

The surface of the parish is varied with several small lakes; the lands are chiefly under tillage; there is a considerable quantity of bog, also a quarry of black marble. The gentlemen's seats are Cooge, the residence of James Dillon, Esq, Annach, of Thomas McDonnell, Esq. Fairs are held at Ballinacostello on June 3rd, Aug 8th, Oct 19th, and Dec 18th.

The parish is in the diocese of Tuam, and is a rectory and vicarage, forming part of the union of Kiltullagh; the tithes amount to £158.4.10. The ancient church is in ruins, but the cemetery is still used.

In the RC divisions it is part of the district of Knock; the chapel is an old thatched building. There are seven pay schools in which are about 550 children. At Cloonfallagh there is a mineral spring.