Within a walled ecclesiastical enclosure in Grange, Co. Kildare, there is a structure that resists easy identification. It is not a church, and the note of that absence is itself the most informative thing about it. What survives is barely legible: a low, grassed-over rectangle of collapsed stone, its walls reduced to somewhere between twenty and forty centimetres in height, spreading to about one and a half metres in width where the rubble has splayed outward over time.

The structure measures roughly eleven metres north to south and six metres east to west, and it sits approximately ten metres west of a church within the same enclosure. That north-south orientation is what rules out the obvious explanation. Early Irish churches were almost universally oriented east to west, so that the altar end faced the rising sun, a convention so consistent that orientation alone can serve as a basic diagnostic. Whatever this building was, a second place of worship it was not. Possibilities that come to mind for ancillary structures within ecclesiastical enclosures of this kind include accommodation for clergy or monks, storage, or a refectory, though the notes do not venture a firm interpretation, and the state of preservation offers little further evidence to work with.