Known locally as "the Church of Park", it is considered the most ancient cemetery in the area, yet when the historian William Carrigan examined it in the early twentieth century, he found that none of the inscribed monuments were old. The antiquity of the place, it seems, is not legible in its stones.

Carrigan, writing in 1905 in his exhaustive history of the Diocese of Ossory, described the graveyard as surrounded by a wall but little better than a wilderness of bushes and briars. An associated church stood nearby, though by his time it had been reduced to wall-footings, the kind of low, grass-covered remains that are easily mistaken for field boundaries. The site had already been mapped twice by the Ordnance Survey, first in the 1839 edition as a small enclosure, and again in the 1900 revision where it appears as the fuller oval shape with trees visible in the interior. That combination, an ancient ecclesiastical enclosure with a ruined church reduced to its foundations, is relatively common across Ireland, where early medieval Christian sites were often established within or beside even older boundaries. What makes Blanchvillespark quietly notable is the persistence of use: Carrigan noted that interments were still taking place there at the time of his writing, the living continuing to bring their dead to a place whose oldest memorials had already worn smooth or disappeared entirely.