A cistern, in this context, would have been a storage vessel or chamber for collecting and holding water, often serving a neighbourhood, an institution, or a private household in an era before piped municipal supply was anything approaching reliable. What makes this particular feature curious is not its function, which was entirely ordinary for the period, but the fact that it exists in the record at all while its exact location does not.

The sole reference comes from Clarke (2002), who notes the former existence of the cistern in 1605 without pinning it to a specific address or plot. Early seventeenth-century Dublin was a city in the middle of significant change, expanding beyond its medieval walls and beginning to develop the infrastructure, however rudimentary, that a growing urban population required. Water management was a persistent concern; cisterns, conduits, and pipes were civic and private investments, and their presence in documentary sources sometimes reflects disputes over ownership or access, or simply the diligence of a particular record-keeper. Without further context from Clarke's work, it is impossible to say which of those circumstances placed this cistern in the written record.

Because the cistern has not been precisely located, there is no site to visit in any conventional sense. It falls into that category of urban historical features that survive only as a line in a secondary source, their physical form lost to subsequent centuries of building, demolition, and street reorganisation. For anyone researching the early modern infrastructure of Dublin's south city, Clarke's 2002 publication would be the logical starting point, though it should be noted that the reference is brief and the gap in spatial information appears to be acknowledged rather than resolved. It is the kind of entry that points to how much of the functional, unglamorous fabric of historical cities simply disappears without leaving a stone above ground.