A church site recorded here points to a long history of Christian settlement in this corner of County Galway, though the details of its age, dedication, and physical condition remain, for now, thinly documented in the public record.

The name Rusheenduff derives from the Irish Roisín Dubh, meaning the little black promontory or headland, a description that suits the low, dark coastal terrain of this part of west Galway. Church sites in townlands like this one often have early medieval origins, sometimes associated with local saints or monastic communities that spread across the west of Ireland between roughly the sixth and twelfth centuries. Whether the remains here represent a simple rural chapel, a pre-Norman foundation, or something later is not yet clear from what has been made available. The site is recorded as a monument, which means it carries some degree of formal recognition and legal protection under Irish heritage law, but the specifics of what survives above or below ground have not been published in accessible form.