Walk it carefully, though, and the ground gives itself away. A slight but persistent undulation traces a roughly circular outline across the hillside, approximately 80 metres in diameter, the ghost of an enclosure that was once, in all probability, somebody's home and farmstead.

This is a rath, the Irish term for a ringfort, a form of enclosed settlement that was widespread in early medieval Ireland, from roughly the sixth to the twelfth centuries. Ringforts typically consisted of an earthen bank, sometimes reinforced with a ditch or a stone wall, encircling a domestic area where a farming family would have kept their household and perhaps their livestock. Thousands once existed across the country; many have been damaged or levelled entirely by centuries of agriculture. The one at Ballinvrokig belongs to that quieter category, its defining earthworks reduced to a faint rise and fall in the turf. What survives more vividly is its position, set on the shoulder of an east-west ridge with extensive views opening out to the south, west, and north. That outlook was almost certainly not accidental. Whoever chose this spot understood the value of elevated ground, whether for watching over land and animals, or simply for the particular sense of command that a wide horizon gives.