Scattered across the Irish landscape in their thousands, fulachtaí fia are among the most common and least understood prehistoric monuments in the country. They appear as low, horseshoe-shaped mounds of fire-cracked stone and dark, charred earth, typically found close to water sources, and the one recorded at Killhill in County Kildare is a quiet example of a phenomenon that archaeologists are still working to fully explain.

The term fulacht fia, sometimes translated loosely as "cooking place of the deer" or "wild deer roasting pit", refers to a type of site that appears to have been in use primarily during the Bronze Age, roughly between 1500 and 500 BC, though some examples date earlier or later. The standard interpretation is that they functioned as outdoor cooking sites: a trough, often timber-lined, would be filled with water, and stones heated in a nearby fire would be dropped in to bring the water to a boil. Repeated heating and rapid cooling causes stone to fracture and crumble, which accounts for the characteristic spreads of shattered rock that define these sites. Some researchers have proposed alternative uses, including hide-working, textile processing, or bathing, and the debate continues. Kildare, low-lying and well-watered, is fertile ground for such sites, and examples have been recorded across the county wherever the conditions, wet ground, accessible stone, a nearby stream, would have suited prehistoric communities.