At the royal site of Dun Ailinne in County Kildare, Ireland, archaeologists have unearthed unique 'bone-inlaid' thresholds at the entrances to Iron Age ceremonial structures. These limestone slabs, embedded with the knuckle bones of cattle, are positioned directly adjacent to massive ash deposits, providing physical evidence for the ancient roots of 'Fire-Jumping' festivals.
The placement of the bones suggests a ritualized path where participants would leap over sacred fires and land on the 'ancestral' stones to ensure protection for the coming season. This discovery offers a tangible link to the legendary Uisneach festivals, confirming that the physical architecture of royal sites was specifically designed to facilitate high-energy, performative ritual movements.