Contrasting demographic impacts of Roman colonization and early medieval migrations in the Iberian Peninsula.

Roman-era Iberia experienced significant influxes of Eastern Mediterranean and North African ancestries, with the Hispano-Roman population remaining largely continuous despite these migrations.

• Why it matters: Understanding how Roman and Germanic control influenced Iberian demography fills a gap in knowledge about regional variation in post-antiquity Europe and contrasts with other regions like Britain and the central Mediterranean.
• What they did: The study analyzed genetic data from 243 ancient individuals dating to 100-800 CE, including 58 previously published samples, to identify ancestry patterns and population continuity during Roman and early medieval periods.
• The result: Findings suggest regional differences in admixture and population stability, with Iberia maintaining demographic continuity despite migrations, contrasting with major changes observed in Britain and the central Mediterranean.