[1] The church lies beside the Kings River, one mile north of Stoneyford village in County Kilkenny, Ireland.

Probably the most distinguished rector and resident of Ennisnag was the famous Irish antiquarian, James Graves, who died in 1886.

Canon William Carrigan suggested "an ancient Church stood on the site from time immemorial to after the Cromwellian era".

[3] John O'Hanlon reported that Diocese of Ossory ecclesiastical records names Saint Manchan as patron saint writing "at Inisnag, diocese of Ossory, St. Manchan, whose feast occurs on the 14th of February, was venerated as a patron (Statuta Dioecesis Ossoriensis)".

The church of Inisnag was recorded as prebendal of Ossory diocese, in the Taxatio Ecclesiastica of AD 1291–1292, and was granted on "the authority of Pope Nicholas IV, 1291 [liber ruber Ossoriensis]".