No name accompanies it. No owner is recorded, no townland boundary pins it down, and no surviving structure has been confidently matched to it. It is one of those architectural ghosts that cartographic history occasionally throws up, present enough to be drawn, absent enough to resist identification.

The map in question is the Down Survey, the remarkable land census commissioned by Oliver Cromwell's government and carried out under the direction of William Petty between 1656 and 1658. Its purpose was bluntly practical: to record forfeited Irish land with enough precision to redistribute it among Cromwellian soldiers and adventurers who had backed the parliamentary cause. Petty's surveyors moved across the country recording townlands, boundaries, and notable buildings, and it is in that last category that this particular structure appears. A gabled building, probably of sixteenth or seventeenth-century construction, sketched in the vicinity of what is now the Islandbridge area on the southern margins of Dublin city. The gable end depicted would have been a recognisable architectural feature of the period, often indicating a building of some substance rather than a simple cabin or outbuilding.

Because the site has not been precisely located, there is no specific address to seek out, no field corner or surviving wall fragment that can be pointed to with any certainty. What the Down Survey map itself offers, however, is genuinely worth examining. Digital versions of the survey are freely accessible online through the Down Survey Project hosted by Trinity College Dublin, and browsing the relevant Dublin baronies gives a tangible sense of how the landscape around the Liffey was recorded and divided in the mid-seventeenth century. The Islandbridge area, where the river was historically fordable and later bridged, was already a zone of some strategic and commercial significance by the time Petty's surveyors passed through. For anyone interested in early modern Dublin, the map rewards patient reading, even when, as here, the building it records has slipped entirely from the historical record.