That kind of marginal geography was not accidental in early Irish ecclesiastical tradition; churches were frequently sited on islands, promontories, or isolated patches of firm ground, places that carried a sense of removal from the everyday world and lent themselves to contemplative or monastic use.

Beyond the evocative place name, the documentary record for this particular church remains, for the moment, largely inaccessible through the usual public channels, and no specific dates, dedications, or architectural details are currently available. What can be said is that Mayo was intensely active in the early medieval period, with a dense network of minor ecclesiastical sites, many of them now reduced to low earthworks, a scatter of worked stone, or nothing more visible than a slightly raised enclosure in a field. A church recorded at Illannaglashy belongs to that broader pattern of rural religious life, the kind of site that rarely drew the attention of later antiquarians but quietly accumulated local significance over centuries.