The evidence is slight: a stony outcrop near the centre of a rath, the kind of subtle surface irregularity that most walkers would step over without a second thought. A rath, for those unfamiliar with the term, is a roughly circular earthwork enclosure, typically dating from the early medieval period in Ireland and associated with farmsteads or small settlements. That a structure once stood inside one would not be unusual in itself. What makes Ballybranigan quietly interesting is how little remains to confirm it.

A report from 1976 recorded the possible house, along with a second candidate to the south-east of the centre of the same enclosure. Both were described as possible rather than definite, suggested by little more than the lie of stones beneath the turf. No excavation appears to have resolved the question. The features are, as the record plainly states, not visible at ground level, which leaves them in a curious archival limbo: documented, referenced, and catalogued, yet effectively invisible to anyone standing on the spot.