That a parish church should appear alongside ringforts, standing stones, and medieval ruins in the same archaeological inventory points to something worth noting: ecclesiastical buildings of the post-Penal era were frequently constructed on or immediately adjacent to sites of much older religious significance, and their formal recognition reflects an interest not just in what was built, but in where and why.

Killimor as a place-name derives from the Irish Coill Iomaire, meaning something close to "ridge of the wood", and the parish has a long ecclesiastical history rooted in the pre-Norman landscape of east Galway. The area falls within the ancient territory of Uí Maine, the Gaelic kingdom whose influence shaped the cultural and religious geography of this part of Connacht for centuries. Catholic worship in rural Connacht during the eighteenth and early nineteenth centuries often took place in modest mass-houses or in the open air, and the construction of more permanent church buildings in the decades following Catholic Emancipation in 1829 was a significant moment for communities across the west of Ireland. A church in Killimor fitting that pattern would represent both a practical and a symbolic shift, the visible re-establishment of Catholic institutional life in a landscape where it had long been practised quietly and without formal architecture.