A completely ivy-clad ruin standing in the south-west corner of a graveyard near Maynooth, this medieval church is rather larger and more architecturally complex than its quiet surroundings might suggest. The structure stretches nearly twenty-five metres from east to west and comprises a nave, a slightly narrower chancel, and a three-storey tower added at a later date to the west gable. Patches of original plaster still cling to the interior wall faces, and the tall, pointed-arched windows, set in broadly splaying round-arched embrasures, are thought to date from the fourteenth century. What catches the eye on closer inspection is the evidence of repeated alteration: doorways punched through what were once window openings, and one surviving example of a cusped ogee-headed window with hood-moulding and concave jambs, probably fifteenth-century work, retrofitted into an earlier ope in the south wall of the chancel.

The church has a long and layered history. It appears in a 1173 confirmation by Strongbow, the Anglo-Norman lord Richard de Clare, of possessions belonging to the monastic site at Glendalough, placing this County Kildare building within the ecclesiastical reach of that famous Wicklow valley. By 1518 it had been united with St. Mary's in nearby Maynooth. The church also has a connection to one of the most significant Hiberno-Norman dynasties in Ireland: the chronicler Archdall records that the First Earl of Kildare died at Laraghbryan in 1316. A visitation record from 1630 noted that the church was still largely intact, though the chancel had by then become 'uncovered', suggesting the roof had already begun to fail. The three-storey tower, entered from the nave through a notably low and narrow round-headed doorway, contains an intramural staircase rising from ground floor to first floor, and a spiral stair continuing to the second, a modest but carefully constructed addition that speaks to the building's continued importance well into the later medieval period.