It is a fulacht fia, a type of site found in enormous numbers across Ireland, estimated in the tens of thousands, yet still not entirely understood. The name, loosely translated from Irish, refers to a cooking place, and the prevailing interpretation is that these were ancient outdoor cooking sites where stones were heated in a fire and then dropped into a water-filled trough to bring it to a boil. The crescent or kidney shape characteristic of these monuments is formed from the accumulated heap of fire-cracked and discarded stones, split by the repeated thermal shock of heating and quenching. Most date to the Bronze Age, broadly spanning from around 2000 to 500 BC, though some examples fall outside that range.

The sheer number of fulachta fia recorded across Ireland suggests they were a routine feature of life rather than anything ceremonial or elite. They cluster near water sources, which makes practical sense given the need to fill and maintain a trough, and they are found in lowland pasture, boggy ground, and river margins throughout the country. Kilkenny has its share, distributed across townlands that have long since been absorbed into farmland. The Frankfort example is one among many registered monuments in the county, its precise dimensions and condition unrecorded in any publicly available detail at present. What is known is simply its classification and location, enough to place it within a tradition of Bronze Age activity that left its mark, quietly and repeatedly, across the Irish countryside.