Known locally as the 'Castle Field', this unassuming patch of land was once home to Niselrath Castle, a formidable tower house that dominated the landscape during the Tudor period. Historical records from 1599 paint a vivid picture of what once stood here: 'a square castle and a great bawne with a good dytche rounde abowte it', as noted by historian Paterson in 1944. The description suggests a typical Irish fortified residence of the era, complete with a bawn; a defensive courtyard wall that would have protected livestock and provided refuge during raids; surrounded by a substantial defensive ditch.

Today, visitors to the site will find no visible traces of this once impressive structure. The stones that formed its walls have long since been carried away, likely repurposed for local building projects over the centuries, whilst the defensive ditch has been filled in by generations of agricultural activity. The castle's complete disappearance from the landscape is not uncommon in Ireland, where countless medieval structures have vanished, leaving only their names in local memory and mentions in dusty archives.

The site's documentation comes from archaeological surveys conducted in the 1980s and early 1990s, which catalogued Louth's rich medieval heritage. Whilst Niselrath Castle may have left no physical footprint, its memory persists in the field's local name, serving as a reminder that even the most ordinary Irish fields often conceal extraordinary histories. For those interested in Ireland's tower house tradition, the site represents one of hundreds of lost fortifications that once dotted the countryside, each telling a story of local power, defence, and ultimately, abandonment.