Known as Templemurry, or alternatively as the Lady's Church, this modest rectangular building measures roughly 12.7 metres east to west and 5.8 metres north to south, dimensions that speak to an intimate, functional space rather than any ambition towards grandeur. What makes it quietly unusual is the way its fabric holds several centuries in one set of walls, each feature belonging to a different moment in its life.

The church dates to around AD 1200, placing its origins in the same general period of ecclesiastical reorganisation that reshaped much of Irish monastic life following the Synod of Rathbreasail and the later Synod of Kells. Worked into the internal face of the north wall is a cross-slab, a carved stone marker of the kind often associated with early Christian burial or commemoration, reused here as a building element. The east wall retains a narrow pointed window, and a similar window, now partially destroyed, survives near the western end of the south wall. The round-headed doorway in the south wall appears to be a later insertion, attributed to the fifteenth century, a reminder that the building continued in active use and was adapted to the tastes or practical needs of a later generation. The west gable, by contrast, survives without any decorative or architectural detail.

Kilmacduagh as a whole rewards slow exploration, and Templemurry sits within the enclosed monastic precinct that makes the site one of the more coherent early medieval complexes in the west of Ireland. The cross-slab embedded in the north wall is easy to overlook but worth seeking out, a fragment of carved stone absorbed into the architecture and surviving there largely because it was too useful as building material to discard.