Belvelly was built in the 14th or 15th century by the Anglo-Norman Hodnett family, one of the smaller settler clans who took up positions around Cork Harbour after the conquest. The Hodnetts later leased the lands back, an arrangement that became common as Norman families intermarried with their Gaelic neighbours and the old hard distinctions softened. The tower house is the standard Irish design of its century: a tall stone block with thick walls, narrow windows, a single defensible entrance, and rooms stacked vertically. You built up because building wide cost more and defended less.

Some sources place Walter Raleigh at Belvelly in the 16th century - the same Raleigh who tormented the Barrys at Barryscourt during the Desmond Rebellions. The castle later passed back to the De Barra family, the Norman dynasty that dominated this part of East Cork. During the Irish Confederate Wars of the mid-17th century, Roger Boyle, 1st Earl of Orrery - one of the Protestant strongmen who anchored Cromwell's settlement of Ireland - used Belvelly to garrison troops. The castle, like most of its peers, was less a residence by then than a strongpoint in a country at war with itself.

By the 19th century Belvelly was a ruin, mossy and forgotten. Then came the First World War, and Queenstown - now Cobh - became a major Allied naval port. The harbour filled with American destroyers, British cruisers, and exhausted sailors with shore leave. Local coachmen spotted opportunity. The famous Blarney Stone was a long drive inland. Belvelly was right here, beside the bridge, with a perfectly castle-shaped silhouette. Some coachmen probably knew exactly what they were doing. Others may have got caught up in the illusion themselves. Either way, sailors kissed stones at Belvelly believing they were getting the Blarney gift of eloquence. The deception is gentle as historical lies go - nobody was harmed, and the sailors went home with stories.

During the Emergency - Ireland's name for the Second World War, which it spent officially neutral - the Irish Army occupied and modified Belvelly. The castle slipped back into disuse afterwards. By the early 21st century it was again a ruin, and in 2016 planning permission was granted for a restoration as a private dwelling. The work cost roughly five million euro and finished in late 2018. The new owners commissioned additional sculptures placed on the roof, a deliberately contemporary flourish on a 15th-century silhouette. They also became sponsors of Cobh Ramblers FC, the local football club - a quiet way of tying the restored castle back to the community it has watched over the bridge for six centuries.