It does not derive from the landscape or from a Gaelic clan but from a Norman family, the de Londons, recorded variously in medieval documents as de Londiniis and de Loundres. Seventeenth-century maps and surveys render the place as Ballylondery and Ballylondry, and the anglicised form we use today has smoothed away those earlier traces almost entirely. The church that bears the town's name is a modest medieval structure, and its fabric tells a story of incremental loss, partial survival, and the quiet persistence of stonework that was never quite finished off.

The antiquarian Thomas Johnson Westropp surveyed the church in the early years of the twentieth century and recorded its principal features in 1904 to 1905. At that time, the gables had already been broken down to the level of the side walls, probably before 1840, yet the north wall remained largely intact. The building measures roughly 15.25 metres by 6.25 metres, a plain rectangular plan typical of rural medieval churches in Munster. What Westropp found most notable was the detailing of the openings: the east window and the south door both had pointed heads cut from single blocks of stone, a simple but deliberate piece of craftsmanship. The south windows and the north door had been defaced by that point and could not be fully described. Close by the church lay a Lady's Well, a holy well dedicated to the Virgin Mary, a common feature of medieval Irish ecclesiastical sites where veneration of a local water source was absorbed into Christian practice.

The church sits within the town of Ballylanders in south County Limerick, not far from the Galtee Mountains. The site is worth approaching with Westropp's description in hand, since the building's most telling details are small ones: the carefully worked single-block lintels of the pointed openings reward close inspection, particularly when the light is low and raking across the stonework. The Lady's Well recorded in the Ordnance Survey Letters lies nearby, and locating it gives a fuller sense of how the medieval site functioned as a whole, combining a place of worship with a sacred water source that would have drawn visitors long before and long after the church itself fell into ruin.