Its name, Caltraghpasty Fort, carries considerable weight, suggesting the presence of a cashel, ringfort, or similar enclosed settlement of early medieval origin. But when archaeologists came to investigate, something quietly odd emerged: local people had no knowledge of its existence at all.

The word "Caltragh" in Irish placenames is generally associated with burial grounds or monastic enclosures, while "fort" in this context would typically point toward a ringfort, one of the tens of thousands of roughly circular earthwork or stone enclosures built across Ireland, primarily between the fifth and twelfth centuries, that served as farmsteads and defended homesteads. The initials CBG in the archaeological record refer to a cashel, a stone-built ringfort, which the name of this site implies. Yet the physical evidence on the ground is modest: a circular depression or platform, a handful of set stones, and an enclosing feature that may or may not relate to the suspected fort beneath or within it. The site sits within the demesne of Clonbrock, the former estate of the Dillon family in north Galway, whose landscaped grounds may well have obscured, absorbed, or simply overlooked whatever structure once gave this spot its name.