The area was home to Corkagh Castle, a medieval structure that by the 1940s had already fallen into considerable ruin. Local historian Ua Broin documented what remained at that time, describing an evocative scene: the ruins consisted of an arched entrance, portions of a battlemented parapet, and eight windows, all contained within a defensive moat that still surrounded the later Corkagh House.

Corkagh House itself was built within this ancient moat, essentially occupying the footprint of the old castle grounds; a common practice in Ireland where newer estates often incorporated or built upon medieval fortifications. The house served the local gentry for centuries before meeting its own end in the 1960s, when it was demolished save for the stable yard. This demolition marked the final chapter in the site’s long residential history, transforming it from a private demesne into public parkland.

Today, visitors to Corkagh Park will find no visible surface traces of either the castle or its moat, despite their documented existence well into the 20th century. The landscape has been thoroughly transformed, with the defensive earthworks filled in and the stone likely repurposed or removed entirely. What remains is the knowledge of what once was; a medieval castle that gave way to a country house, which in turn gave way to the recreational grounds enjoyed by Dubliners today, each layer of history absorbed into the earth of this quietly significant site.