The one at Knockloe, in County Wicklow, fits that description on paper: a low circular mound of around eight metres in diameter, a shallow surrounding fosse, and faint traces of an external bank. But something about this site gives archaeologists pause, and that uncertainty is precisely what makes it interesting.

The mound sits on flat grassland just north of the abandoned ruins of Knockloe House, beside the old driveway that once led up to the property. It is one of a cluster of five similar earthworks gathered into a surprisingly small field, roughly 59 metres by 110 metres, all of them visible on aerial photographs taken in 2005 and 2011. The proximity to the country house, the tight grouping of the earthworks, and the fact that the landowner recalled the field being used to ring horses in the nineteenth century, training them in circles on a long rein, raise genuine questions about whether these features are ancient at all or whether some of them are the residue of that more recent equestrian use. One of the five earthworks, visible on aerial photography, appears to be nothing more than a circular feeding trough. If that one is modern, it becomes harder to be confident about the others, clustered so neatly beside a nineteenth-century estate. The mound itself has the right dimensions and form for a ring barrow, but the wider picture is ambiguous, and it remains a site of open archaeological question rather than settled identification.