Berytus: Roman Beirut in DNA

Beirut—known to the Romans as Berytus—sits at the crossroads of Levantine coasts and Mediterranean trade routes. Archaeological layers from late Hellenistic into the Roman imperial period show expanding urban infrastructure: paved streets, baths, and public buildings that mark the city’s growing role as a regional center. Limited evidence suggests that this growth was fueled by sustained maritime commerce, imperial administration, and local Phoenician traditions adapting to Roman rule.

The four ancient individuals dated between 170 BCE and 235 CE come from urban contexts in Beirut. Archaeological data indicates continuity in settlement and a blend of local and imported material culture, consistent with a port city where goods — and people — moved frequently. Genetic data from these few samples hints at a population rooted in the Near Eastern genetic landscape but open to Mediterranean connections. Because sample count is small (n=4), interpretations are preliminary: these genomes provide snapshots rather than a full demographic portrait. Future excavation and aDNA sampling across different cemeteries, social contexts, and chronological layers in Beirut will be essential to move from evocative glimpses to robust narratives.

The genetic dataset from Beirut consists of four individuals dated 170 BCE–235 CE — a very small sample that must be treated as preliminary. Two of the four males carry Y-chromosome haplogroup G. Haplogroup G has a deep presence across the Near East and Caucasus and appears at varying frequencies in Mediterranean contexts; its presence here is compatible with long-standing regional male lineages but does not, on its own, reveal specific migration events.

Mitochondrial haplogroups observed are H8b, T, I, and N (one individual each). Haplogroup H and its subclades are widespread in Europe and the Near East; T is common in both regions as well; I has a higher frequency in Europe but is also seen in the Near East; N is a basal Eurasian lineage with deep antiquity. The mix of mtDNA haplogroups suggests maternal lineages that reflect both local Near Eastern ancestry and broader Mediterranean connectivity.

Importantly, autosomal genome-wide data (not summarized here) would be needed to quantify ancestry proportions and admixture timing. Given n=4, statistical power is limited: patterns that appear may change with larger, geographically and temporally diverse sampling. Archaeological context (urban port, trade artifacts) aligns with genetic signals of connectivity, but firm demographic conclusions require more samples and integrated isotopic and archaeological analyses.