The site at Baysrath is not the kind of place that announces itself, but the evidence recovered there offers a precise and rather striking window into Iron Age industrial life, the sort of detail that tends to get lost when history is told only through monuments and manuscripts.

The site was excavated in 2006 and 2007 ahead of improvements to the N9/N10 route between Kilcullen and Waterford. What the excavators found, southeast of an Iron Age palisaded enclosure, were three clusters of furnaces along with associated pits, plus two further isolated examples of what are known as bowl furnaces, shallow circular hearths dug into the ground and used to generate the intense heat needed for working iron. Each of the bowl furnaces followed the same pattern: circular in plan, and packed with iron slag, charcoal, and oxidised clay, the physical residue of repeated high-temperature firing. Specialist analysis of the metallurgical remains confirmed that two distinct processes had taken place here: iron smelting, which converts raw ore into usable metal, and iron smithing, the shaping of that metal into finished objects. Stake-holes and post-holes in the immediate vicinity suggest some kind of structural arrangement around the working area, perhaps a shelter or a frame for organising the work. Three radiocarbon dates place activity at the site across a considerable span, from as early as 352 to 295 BC through to somewhere between 42 BC and AD 62, meaning the location was in use during the later Iron Age and continued into the early centuries around the turn of the millennium. That the metalworking area sat in the shadow of a palisaded enclosure, a fenced or stockaded settlement, suggests a close relationship between the people living there and the craft being practised just outside its boundary.