That a relatively recent place of worship should find itself listed alongside prehistoric earthworks says something about how Ireland catalogues its built heritage, drawing a long line from the earliest human traces right up through the centuries of post-Penal church building.

Killeroran is a small rural parish in the barony of Loughrea, and like many such parishes across Connacht, its Catholic congregation would have worshipped in modest, often makeshift surroundings well into the eighteenth or early nineteenth century, before more permanent church buildings became possible following Catholic Emancipation in 1829. The gradual lifting of the Penal Laws, which had severely restricted Catholic worship and property rights, allowed parishes across Ireland to commission proper stone churches for the first time in generations. The church at Killeroran belongs to that broader wave of construction, though the specific details of its founding, its architect, and any notable features of its fabric remain to be fully documented.