A medieval church and its graveyard stand at Laraghbryan, just outside Maynooth, on ground that was once an early monastic settlement of some consequence. Almost nothing of the original monastery is visible today; the centuries have buried it almost entirely, leaving only a fragment of what may have been its enclosing boundary, roughly 250 metres to the north-east, as the faintest suggestion that something older lies beneath.

The foundation is associated with St Senan, most likely the same Senan connected to the monastery on Scattery Island in the Shannon estuary in County Clare, though the attribution carries the usual uncertainties of early Irish hagiography. The community was active enough to have named abbots: a man called Glaindibur held that office, and his death is recorded in AD 767. Its position on a major east-west routeway gave the site a particular function; it appears to have served as a rest house, a place where pilgrims and clerics travelling across the country could shelter and recover. That practical role did not protect it from the violence that periodically swept through early medieval Ireland. The oratory was burnt and plundered by the men of Meath in AD 1036, and then again in AD 1040, suggesting the site was worth targeting twice within a few years. A later and more singular note comes from the antiquary Archdall, who records that the First Earl of Kildare died at Laraghbryan in AD 1316, a detail that places this quiet site briefly into the wider story of Anglo-Norman power in the region. The medieval church that eventually rose here, probably on or very close to the earlier monastic ground, has outlasted almost everything that preceded it.