Though no castle remains today, historical records paint an intriguing picture of what once stood here. In 1641, the land belonged to James FitzJones, identified in documents as an Irish Catholic who held 162 acres at Fyanstown. The Down Survey maps from 1656 to 1658 recorded the estate as encompassing 225 acres, though curiously, they make no mention of any castle structure on the property.

The mystery deepens when examining later cartographic evidence. Both the 1836 and 1912 Ordnance Survey six-inch maps clearly mark a castle at this location, suggesting either the structure was built after the Down Survey period or was simply overlooked by earlier surveyors. The fact that FitzJones was a prominent enough landowner to hold such substantial acreage during a turbulent period in Irish history makes the absence of castle references in the 1640s and 1650s particularly puzzling.

Today, visitors to Fyanstown will find no trace of the castle that once stood here; the structure appears to have been demolished sometime after 1912. The site serves as a reminder of how Ireland’s built heritage has been lost over time, whether through deliberate destruction, neglect, or the simple passage of centuries. Archaeological surveys continue to piece together the story of places like Fyanstown, where the landscape itself holds memories of vanished strongholds and the families who once called them home.