No trace of it survives above ground. Nobody today can say precisely where it stood. What we do know comes almost entirely from a single entry in a thirteenth-century administrative record, which makes it one of the more oddly specific absences in the city's archaeology.

The Dublin White Book, a collection of civic records, noted in 1231 that a man named Roger le Corviser of Bristol, described as a settler in the city of Dublin, had erected a mill below the castle. In exchange for the mill-site and for the right to open a lane towards the nearby church of St. Peter de la Hulle, through which tenants could carry corn for grinding, Roger and the other mill users paid a pound of pepper annually to the King. Pepper rents of this kind were a recognised feature of medieval land tenure, a nominal payment that acknowledged royal ownership without placing a heavy financial burden on the tenant. The arrangement did not last. The King's justices and treasurers decided that the mill was both injurious and perilous to the castle, and that it sat too close to the King's own mills. They had it pulled down and its materials carried away entirely. The millpond site, held at that point near land belonging to a man named Serlot of Ripon, was subsequently let for two shillings a year to the constable of the castle. The record, cited in the Calendar of Ancient Records of Dublin and discussed by Bradley and King in 1987, is detailed enough to place the mill in a specific social and legal context, yet not precise enough to fix it on a map.

For anyone curious enough to go looking, the area immediately south of Dublin Castle, around the small park mentioned in the historic record as the place where the mill once stood, is freely accessible. There is nothing to see in the conventional sense, no marker, no outline, no interpretive panel. The interest lies entirely in the act of reading the landscape speculatively, knowing that somewhere underfoot a thirteenth-century structure was dismantled at the crown's insistence and its exact position has not been recovered since.