That tension, between a place significant enough to be recorded and one whose particulars have not yet been published, is not unusual in the Irish archaeological landscape, but it does give sites like this a particular quality of quiet obscurity.

Castlegannon is a townland name that carries its own suggestion of history. The element "gannon" likely derives from the Irish, and the "castle" prefix points to some form of fortified structure in the area's past, though whether that was a Norman tower house, an earthwork, or something else entirely is not established here. Graveyards in rural Ireland frequently occupy ground with much longer histories than their most recent headstones imply. Many were attached to early medieval churches, some of which have long since vanished, leaving only the burial ground as evidence that a community once gathered there. Others continued in use across centuries, accumulating layers of local memory in stone and soil.

Without further detail available, what can be said is that the graveyard at Castlegannon is a recorded monument, which means it has been identified as being of sufficient archaeological or historical significance to warrant protection and study. Visitors to Kilkenny's townlands often encounter these small, sometimes overgrown burial grounds at the edges of fields or beside unmarked laneways, their kerbed plots and inscribed stones offering fragments of local genealogy to anyone who takes the time to look.