Excavations in the area uncovered the partial remains of a harbour dating to the 13th century, a discovery that quietly redraws our understanding of how the medieval city managed its relationship with the River Liffey. What emerged from the ground was not simply a wall but evidence of a sophisticated piece of water infrastructure, suggesting a level of planning and engineering that is easy to underestimate when thinking about urban life in medieval Ireland.

The excavation, reported by Swan in 2000, revealed a riverfront wall with a built-in opening, likely functioning as a sluice, a controlled gap that could regulate the flow of water in and out of an enclosed space. Behind this wall, an arrangement of timber revetments, essentially wooden frameworks used to line and stabilise the banks of an excavated area, created what appears to have been an internal dock or harbour. The combination of masonry and timber is characteristic of medieval waterfront construction, where permanence and practicality had to be balanced against the constant pressure of tidal and river water. That this structure survives in any form at all, even partially, is due to the preserving qualities of waterlogged ground conditions, which can keep organic materials like timber intact for centuries.

The site sits within the broader archaeology of Dublin's south city, an area where medieval layers are regularly encountered during development groundwork, though rarely in conditions that allow much to be recorded in detail. For those interested in visiting with the archaeology in mind, the above-ground landscape gives little away; there is no visible trace of the harbour at street level. The value lies in knowing it is there, somewhere underfoot, and in consulting the published excavation report for a fuller picture of what was found and where. The area around the south quays repays a slow walk with a good map of medieval Dublin to hand, placing the modern streetscape against the older geography of a city that was always, in some sense, built on its waterfront.