Dubhoileán Mór, whose name translates roughly from Irish as "the great dark island", is one of many small islands scattered along Ireland's western seaboard, and like a number of such places it preserves traces of devotional practice that predate the formal structures of the Church. Holy wells in Ireland occupy a peculiar middle ground between pre-Christian water veneration and Catholic folk religion; they were typically visited on a patron saint's feast day, with pilgrims performing "rounds", a ritualised circuit of prayers and physical movement around the well and any associated stones or markers. The presence of such a site on Dubhoileán Mór suggests a community that once sustained its own local sacred geography, however modest.

Beyond the name of the island and the county, the specific history of this particular well remains elusive. No patron saint, founding legend, or record of pilgrimage patterns has been documented in any source currently available to the public. That absence is itself telling. Islands along the Mayo coast were often home to small, tight-knit communities whose religious and ritual lives went largely unchronicled, leaving behind only the physical features, a spring, a worn stone, perhaps a scattering of votive offerings, as evidence that people came here and considered the water worth honouring.