That a tower should carry this name in a quietly rural corner of Connacht is itself a small puzzle, one that points toward a longer story not yet fully recovered.

The Esker area sits along the line of the great esker ridges, glacially deposited gravel and sand formations that run east to west across the Irish midlands and historically served as natural causeways through boggy lowland terrain. Towers of this kind in rural Galway are often connected to late medieval tower house culture, when local Gaelic and Anglo-Norman families built compact fortified residences as statements of local authority. Without more specific documentation presently available, the precise date of construction, the family responsible, and the tower's subsequent history remain difficult to establish with confidence. What can be said is that the combination of the Banagher placename and a surviving tower structure in this landscape suggests a site with layers reaching back well before the modern period.