The name translates loosely as the hole or hollow of the horse, a toponym that hints at a distinctive feature of the local terrain, though whether that feature is a cave, a depression, or something else entirely is the kind of detail that tends to get absorbed into the land itself over time. Megalithic tombs are among the oldest constructed monuments in Ireland, built during the Neolithic period, roughly between five and six thousand years ago, and they took a variety of forms: portal tombs, court tombs, passage tombs, and wedge tombs each represent a different tradition of communal burial and monument-building. Mayo has a notable concentration of these structures, scattered across bogland and upland that has, in many cases, preserved them precisely because it was never worth clearing them away.

Beyond its location in that corner of Mayo and its classification as a megalithic tomb, the specific details of this particular monument remain difficult to pin down from the available record. What can be said is that the site carries enough archaeological significance to be formally recorded, and that the Irish name attached to it suggests the place had an identity and a meaning in local memory long after the people who built the tomb had passed from any possible recollection. That kind of layering, a Neolithic structure wearing a medieval or early modern Irish place name, is not unusual in the Irish countryside, where the same patch of ground can carry several thousand years of association without any single era fully displacing the others.