This is Cahergal, a cashel, meaning a stone-walled early medieval enclosure, whose walls have long since fallen into ruin. What makes the site particularly striking is not the fortification itself but what occupies its interior: a children's burial ground, a cillín, set down within the old enclosure at some point after the cashel ceased to function as a living settlement.

Cillíní are found across Ireland, places where unbaptised children and others excluded from consecrated ground were quietly buried, often at liminal or ancient sites, locations already set apart from ordinary use. The choice of a ruined cashel for such burials would not have been accidental. Old enclosures carried a certain gravity, already separated from the working landscape around them. The site at Ballynamanagh was noted by Holt in 1912, by O'Flanagan in 1927, and by McCaffrey in 1952, suggesting it has been a recognised feature of the local landscape for well over a century, even as the scrubland gradually closed around it.