What remains today is a short stretch of mortared rubble wall, standing three metres high and two metres thick, perched on the eastern edge of a motte’s summit. This four-metre section of wall likely represents the last vestiges of a medieval castle that once commanded this strategic position in the Rathcline barony.

Historical records provide tantalising details about the site’s past. In 1518, the rental book of the Earl of Kildare mentions payment from ‘Castell Corr 2 cartrons with the werys’, suggesting the castle was still functioning as part of the earl’s estates during the Tudor period. The site’s importance is further confirmed by its appearance on an early 17th-century map of Rathcline barony, now held in the British Library’s Cotton collection, which clearly depicts a castle at this location.

The association with a motte indicates that Castlecore’s defensive history stretches back even further, possibly to the Anglo-Norman period when these earthwork fortifications were commonly constructed across Ireland. The later stone castle would have been built atop or alongside this earlier earthwork, creating a palimpsest of military architecture that evolved over centuries. Today, these weathered remains stand as silent witnesses to the complex patterns of conquest, settlement, and power that shaped medieval Longford.