In the heart of modern-day Lyon, archaeologists have discovered a subterranean vault containing the official census registry for the Roman province of Gallia Lugdunensis. Dating to the reign of Hadrian, the find consists of hundreds of lead demographic tablets that recorded the names, occupations, and tax obligations of thousands of citizens and non-citizens. This is the first time such a large-scale administrative archive has been found intact outside of Rome.
The tablets provide unprecedented data on migration patterns, mortality rates, and the ethnic diversity of the provincial capital. Unlike the more common wax tablets, these lead records were intended for long-term storage in the imperial archives. The discovery offers a granular look at the efficiency of the Roman bureaucratic machine and how it managed the complex demographics of its expanding frontiers during the 2nd century CE.