That gap between official recognition and available detail is itself a kind of fact, a reminder that Ireland's landscape holds far more catalogued sites than the written record has yet caught up with.

Oldcastle is a townland in Kilkenny, and graveyards in such locations frequently have long roots, sometimes medieval or earlier, occasionally attached to a vanished church or monastic enclosure whose physical traces have been swallowed by the land. Without surviving documentation, it is not possible to say with confidence when this site was first used, by whom, or whether any structures once accompanied it. What the formal designation confirms is that someone, at some point, judged it significant enough to protect.