The graveyard that surrounds it shares in that deep continuity, accumulating centuries of local burial practice around a structure whose origins stretch back to the early medieval period. Graveyards of this kind, attached to ancient ecclesiastical foundations, often hold a stratigraphic quality that formal monuments rarely match: headstones from the eighteenth and nineteenth centuries crowd against ground that was already considered sacred long before their carving.

The church at Tomgraney, dedicated to Saint Cronan, is generally dated to the tenth century, making it an unusually intact remnant of early Irish Christian architecture. The settlement itself grew from a monastic foundation, and the graveyard reflects that long continuity of use, with the dead of many generations laid in ground that has served the same purpose without significant interruption. That kind of unbroken use is rarer than it might seem; many early medieval church sites were abandoned, robbed for building material, or absorbed into later landlord demesnes, leaving their graveyards to become overgrown enclosures visited only by cattle and antiquarians.