What we have is essentially a single sentence of historical record, a brief mention that a chapel existed in this location in 1597, preserved in Clarke's 2002 study. No plan survives, no dedication is known, and the precise spot has never been confidently identified. It is, in the most literal sense, a place that exists only in a footnote.

St Mary's Abbey was one of the most significant Cistercian monasteries in medieval Ireland, founded in the twelfth century on the north bank of the Liffey, in an area that then lay well outside the city walls of Dublin. By the time Clarke's source records this chapel in 1597, the abbey itself had already been suppressed for decades under the Henrician dissolution of the monasteries, which swept through Irish religious houses from the 1530s onwards. The mention of a chapel near the northern gate at that late date raises quiet questions: was it a surviving fragment of the monastic complex still in some kind of use, a small ancillary structure that had escaped demolition, or something erected independently? The record does not say. Clarke's note places it in the vicinity of the gate, but that is the limit of what can be stated with any confidence.

The area around St Mary's Abbey today is largely absorbed into the commercial fabric of north Dublin city, around Capel Street and Mary's Abbey street. Visitors interested in the broader monastic site can see the surviving chapter house, which is managed by the Office of Public Works and is occasionally open to the public, though opening times are limited and worth checking in advance. The chapter house gives a genuine sense of the scale and quality of the original complex. As for the chapel itself, there is nothing to see and no marker to find. It belongs to that category of historical sites that rewards not the eye but the imagination, a small structure that once stood at a gate, served some unknown purpose, and left behind only a single line of text.