The Catholic church here, however, holds its own quiet place in the architectural and religious fabric of the east Galway shoreline, sitting in a town that has long occupied a strategic crossing point on the River Shannon at the northern tip of Lough Derg.

Portumna's history is bound up with the Burke family, later the de Burgos, and the Dominican friary they established in the early thirteenth century. The town that grew around the crossing point developed slowly, shaped by successive waves of plantation, landlordism, and the particular pressures of Connacht's post-Reformation Catholic community. Catholic church buildings in towns like Portumna were often modest or deliberately inconspicuous during the Penal era, when public Catholic worship was legally suppressed, and later rebuilt or replaced entirely as Emancipation in 1829 allowed congregations to construct more permanent and visible structures. The church here belongs to that broader pattern of Catholic building that reshaped Irish town centres throughout the nineteenth century.