Known in Irish as cillíní, these informal burial grounds occupy a quiet and melancholy corner of social history, shaped by Catholic doctrine that long held unbaptised souls to be excluded from the rites and ground reserved for the faithful. On Brideswell Commons in County Dublin, one such place survives in the landscape record, its form modest but legible: a mound of earth enclosed by a ditch, lying close to St. Brigid's holy well.

The sole published account of this site comes from Ua O'Broin, writing in 1944, who recorded the burial place as it was then understood locally. The association with St. Brigid's well is significant. Holy wells in Ireland frequently attracted a range of devotional and liminal functions, and it was not uncommon for the unconsecrated dead, including unbaptised infants, stillborn children, and occasionally suicides or strangers, to be interred near such sites. The well itself, dedicated to one of Ireland's most venerated saints, would have lent the adjacent ground a degree of sanctity that formal Church burial denied these children. The mound and enclosing ditch described by Ua O'Broin suggest a deliberately bounded space, separated from its surroundings in a way that mirrors, however informally, the logic of a marked burial plot.

Brideswell Commons lies in County Dublin, and the site sits close to the holy well from which the commons takes its name. The landscape in such areas can be deceptively ordinary, and cillíní are easily overlooked without prior knowledge of what to look for. The earthwork described, a low mound within a ditch, would be subtle on the ground and may have altered over the intervening decades since Ua O'Broin's note was published. Anyone seeking the site should treat it with the quietness it warrants; these were real burials, carried out in grief and often in secrecy, by families navigating the rigid boundaries of religious practice. The holy well nearby may be more immediately visible and offers its own separate history worth pausing over.