Iberian populations genetically stable till Romans

[guy]

 

This study showed that immigrants had very little impact on the indigenous Iberian populations before the Roman invasion.

Northeastern Iberia did experience immigration from outside before the Romans, as shown by this genomic study. The study indicates that this immigration was limited, layered over a stable local population, and did not cause a mass replacement. Beginning in the late Bronze and early Iron Age, Phoenician traders, Greek colonists, and later Carthaginians established coastal enclaves and commercial networks that brought small numbers of newcomers into the region. Their genetic impact appears as a gradual rise in Mediterranean‑related ancestry, consistent with intermarriage, adoption, and long-term contact rather than settlement colonies transforming the population.

The first major demographic change really took off when Rome expanded its reach. Soldiers, administrators, slaves, and migrants from all over the empire brought a richer mix of ancestries, leading to the more diverse genetic profile we observe after the 2nd–1st centuries BCE. In simple terms, northeastern Iberia was welcoming to the Mediterranean world, but before Rome, immigration was a slow and steady process rather than a sudden, sweeping transformation.

Here is the study:

Ancient DNA from 54 newborns across northeastern Iberia shows that local communities maintained a stable, Bronze Age–derived genetic profile for roughly 600 years (ca. 775 BCE–50 CE), even as they interacted extensively with Phoenician, Greek, and later Roman Mediterranean cultures. The rise of Iberian culture in the 6th century BCE was not driven by a mass migration; instead, it emerged from local populations whose Mediterranean-related ancestry gradually increased but remained modest. This genetic stability persisted until the Roman expansion, when new genetic exposure introduced diversity.

The findings indicate that long-term cultural change in the region was not accompanied by major demographic replacement until the Roman period.

 

https://www.cell.com/iscience/fulltext/S2589-0042(26)01561-0?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2589004226015610%3Fshowall%3Dtrue
 

 

Edited June 13 by guy