The castle’s history can be traced back to at least 1640, when Bartholomew Cusack owned 228 acres here in the barony of Deece. According to the Civil Survey of 1654-6, his property included not just the castle but also two corn mills, suggesting this was a working estate rather than merely a defensive structure. The Down Survey maps from 1656-8 show it as a small gabled house, whilst the nearby parish church of Trubley lies about 170 metres to the southwest.

Historical accounts paint an intriguing picture of the castle’s architecture. Writing in 1850, William Wilde described the remains as a square tower with circular corner towers; an unusual design that combined both angular and curved defensive elements. By the time the Ordnance Survey mapped the area in detail, only two circular towers remained, standing roughly 20 metres apart. One of these may have been a corner tower from a bawn, the fortified courtyard wall that typically surrounded Irish tower houses.

Sadly, Trubley Castle met an ignominious end. The last surviving remnants were blown down during a storm in the 1970s, and whatever remained was subsequently cleared away without trace in what is now a farmyard. Today, visitors to the site will find no visible evidence of this once-substantial fortification that stood guard over the Boyne for centuries, though its memory lives on in historical records and maps.