Nothing announces it particularly. The fields look ordinary enough, yet beneath the grass lie the footings of a stone town wall, the stumps of small square mural towers, and the remains of a drawbridge that once controlled passage between a market town and the castle set to defend it. The place is Ardnurcher, and the fact that it is now entirely deserted makes its surviving defences, modest as they are, all the more legible as a piece of medieval planning.

The canton of Ardnurcher was granted in the early 1170s by Hugh de Lacy to Meiler FitzHenry, and the settlement that grew up there was functioning as a market town before 1200, when the Annals of Clonmacnoise record that people associated with Meyler Bermingham "tooke the spoyle of the castle of Ardnurcher and burnt all the houses of the markett." That same source records a further raid in 1213, when Cormack Mac Art O'Melaghlin took a "great prey" from the town and its castle on consecutive days. By around 1235, the settlement had acquired borough status, confirmed by a reference to a burgage in a charter of Walter de Lacy. A burgage was a standard unit of property tenure in medieval planned towns, essentially a plot held in exchange for rent rather than military service. The Annals repeatedly refer to the inhabitants as the "Englishmen of Ardnurcher," a reminder of how sharply the colonial frontier was understood by contemporaries. That frontier could be brutal: in 1234, the town and nearby Ballyloughloe were burned by Fedlimid O Conchobhair, King of Connacht. The defences, then, were not decorative. An Anglo-Norman motte and bailey castle, a raised earthen mound with an attached enclosure, sat at the north-eastern corner of the town wall, overlooking a stream and marshy ground. A stone drawbridge connecting the settlement to the castle bailey also served as the town's main gateway, and a surveying plan drawn by Brownrigg in 1788 shows the old approach road forking just before it: one branch into the castle, one climbing the ridge westward into the town. Brownrigg labelled that road the "Ancient road from the Borders into the English Pale."

The town wall enclosed an irregular area measuring roughly 360 metres east to west. The south-eastern stretch, about 130 metres long, ran along the edge of the high ground above the river valley, and the grass-covered footings of two projecting mural towers along this section are still visible, as recorded on the Ordnance Survey six-inch map of 1837. On the western side, 75 metres from the medieval church and graveyard, a stone structure survives that may have been a gatehouse, with further wall footings and the base of another small tower traceable nearby. These remnants are quiet and require patience to read, but the overall circuit of the town's defences, connecting church, castle, drawbridge, and wall, can still be pieced together across the fields of what Brownrigg simply called "high arable land."