That is not a riddle so much as a quietly frustrating fact of record: a late-medieval tombstone commemorating a Captain Dunbar, once noted as adjoining a vault within the church, has since disappeared from view, leaving only the account of it behind.

The stone was documented by W.G. Wood-Martin in 1882, in what remains one of the more thorough antiquarian surveys of Sligo's material heritage. Wood-Martin placed the Dunbar tombstone inside Aghanagh church, where it formerly sat alongside a vault. That same church still contains a second late-medieval headstone, this one belonging to the Hughes family, which has fared better in terms of survival. Late-medieval grave slabs of this kind, typically cut from local stone and carved with inscriptions or heraldic devices, were markers of some social standing; a Captain Dunbar would have been a figure of local consequence, military or otherwise, and the decision to inter him within the church itself rather than in the surrounding churchyard reflects that status. Whether the Dunbar stone was moved, built over, broken up, or simply lost to the gradual disorder that overtakes disused sacred spaces is not known.