The castle’s history traces back to the early 17th century when it was held by the Furlong family from the manor of Keyer. In 1638, James Furlong sold the property to his cousin Phillip, son of Sir James Devereux of Ballymagir, who subsequently passed it to his son Robert, possibly associated with Ballyshannon Castle.

By 1640, according to the Civil Survey conducted between 1654 and 1656, Robert Devereux owned what was already described as a large ruined stone building at Carrigmannon, along with 120 acres of land. His holdings also included an additional 180 acres in nearby Ballybane, possibly modern-day Bolabaun, all within the small parish of Chapel Caran. The castle’s rectangular footprint, measuring approximately 10 metres east to west and 8 metres north to south, can still be traced on the 1839 Ordnance Survey map, though time and nature have conspired to hide its remains from casual observation.

The castle occupied a strategic position on an east-facing slope, with the River Slaney flowing roughly 90 metres to the east and the Ballyvoleen River curving around it at a distance of 15 to 20 metres to the west and north. This elevated ground would have provided both defensive advantages and commanding views of the surrounding countryside. Today, the site remains concealed beneath woodland cover, invisible at ground level; a silent testament to the changing fortunes of Irish landed families during a turbulent period of the country’s history.