Researchers from Sweden and Spain have conducted a comprehensive archaeogenetic study on a community that lived on the border between the northern Christian kingdoms and Al-Andalus during the early Medieval period. This dynamic era, especially in the Iberian Peninsula, was marked by religious competition, power struggles, and significant human mobility—factors that shaped the foundation of modern Europe.

The study, published in the journal Science Advances, focused on Las Gobas, a rural site in northern Spain's Burgos province, near the village of Laño. The community existed from the mid-6th to the 11th century and is notable for its church and living areas carved into caves. The site also provides evidence of violence, likely from sword blows, found on some of the buried individuals. Forty-one burials were excavated, and 39 of them were subjected to archaeogenetic analysis.

The interdisciplinary research, led by Ricardo Rodríguez Varela from the Centre for Palaeogenetics (CPG) in Stockholm, integrated genetic, archaeological, and historical data to reveal the presence of an endogamous community in northern Iberia that remained relatively isolated despite centuries of turbulent regional history.

"Our findings indicate that this community stayed relatively isolated for at least five centuries," said Rodríguez Varela. Although Las Gobas is located just north of regions under Islamic rule, "we found relatively low levels of North African and Middle Eastern ancestry compared to other medieval individuals from the Iberian Peninsula, and we did not observe a significant increase in these ancestries after the Islamic conquest of Iberia," he concluded.