Built in the 15th century, likely by Conor O’Reilly, this castle and its lands eventually passed to the Fleming family by 1641. Though the structure fell into disuse following the Plantation period, historical records offer tantalising glimpses of its former significance; the Down Survey maps from 1656 to 1658 mark it as a fortified enclosure with a house, suggesting it retained some importance even after abandonment.

Whilst little remains visible today, earlier archaeological surveys paint a picture of what once stood here. In 1947, observers documented what appeared to be three walls of a bawn, a defensive wall typical of Irish fortified houses, forming an irregular rectangle measuring approximately 58 by 44 metres. The northwestern wall, which likely contained the main entrance, seems to have been lost to road construction over the years. These remnants hint at a substantial defensive structure that would have dominated the local landscape.

The site holds a special place in local memory, with tradition linking it to the ‘Fair Green’ at nearby Muff, suggesting it served as more than just a military stronghold. This connection to community gatherings and commerce speaks to the castle’s role as a focal point for the area’s social and economic life. Though the stones have largely vanished, the site continues to intrigue historians and archaeologists seeking to understand the complex layers of Irish history written into this Cavan landscape.