What is recorded here

Castle O'Brien stands atop a two-hundred-foot knoll in County Westmeath, commanding sweeping views across undulating pastures towards the River Shannon valley. What remains today is a rectangular structure measuring roughly ten metres east to west and six metres north to south, its collapsed stone walls best preserved at the southwest corner where visitors can still make out the original wall angles and interior facing. The site, marked as Castle O'Brien on the 1910 Ordnance Survey map, sits within the former grounds of Creggan House, though time and nature have reduced much of the structure to rubble-strewn foundations standing no more than a metre and a half high. The castle ruins tell only part of the story of this hillside settlement. Additional

Castle O'Brien is recorded as a castle in County Westmeath. Its open map record supplies this location and any linked names or public references.

Built by the O'Brien family, likely in the 13th or 14th century, Castle O'Brien is remembered as a historic family seat associated with the prominent Gaelic Irish dynasty in County Westmeath.