Medieval Vilnius Drew Christian Migrants to Last Pagan State

The investigation centered on a burial ground situated on Bokšto Street within Vilnius Old Town, where archaeologists unearthed Christian graves dating back to the late 13th and 14th centuries. These burials astonished researchers, given that Lithuania was still officially a pagan nation during much of this era. The groundbreaking findings were recently published in the journal Antiquity.

An international collaborative team meticulously examined the remains of 15 individuals interred at the site. They analyzed isotopes preserved within tooth enamel, dentine, and bone collagen. Because these biological tissues develop at distinct stages of life, they capture a detailed record of childhood origins, dietary habits, and later life changes — allowing scientists to trace where an individual spent their formative years and whether they migrated during their lifetime.

Tracing the Origins of Early Christians

The analytical results provided compelling evidence that several individuals were not native to the Vilnius vicinity. Some are believed to have migrated from the former Kievan Rus’, a vast territory encompassing regions of present-day western Ukraine and southern Poland. Historical chronicles confirm that these neighboring lands maintained intricate political and religious interactions with medieval Lithuania, and the isotopic data now provides the first direct biological confirmation of this connection.

Silver gilded ring from grave 21, one of the Byzantine-style artifacts recovered from the Bokšto Street cemetery. (Algis Blažys / Antiquity Journal)

Among the subjects, one young man distinctly stood out. His isotopic signatures deviated significantly from the local populace, indicating a childhood spent in southeastern Europe. His diet also incorporated millet, a grain that had largely fallen out of favor in northeastern Europe by that period but remained a staple further south. Researchers hypothesize that he relocated to Vilnius during his adolescent years and successfully integrated into the community, with his burial in Grave 311 offering a rare snapshot of individual medieval migration.

Other individuals also exhibited subtle indications of having grown up beyond the city limits, though the data was less definitive. Some men may have spent portions of their youth in significant early political centers like Kernavė. The research team emphasized that expanded future studies will be crucial to rigorously test these preliminary hypotheses and build a more comprehensive picture of movement into the early city.

A Community Forged by Migration and Marriage

The demographic pattern observed among the women was strikingly different. The majority of the female subjects analyzed possessed isotopic profiles consistent with the local Vilnius region, strongly suggesting they were native-born. This points toward a dynamic community where immigrant Christian men frequently intermarried with local women, who likely embraced Orthodox Christianity subsequent to joining these newly formed families.

These biological revelations align perfectly with the archaeological clues previously uncovered at the Bokšto Street cemetery. The presence of Byzantine-style jewelry, distinctive crosses, chaplets, specific burial customs, and imported artifacts had long hinted at profound connections with the broader Orthodox Christian sphere. The new isotopic data now offers direct biological confirmation that migration was a catalyst in the establishment of Vilnius’ earliest Christian enclaves.

The head ornaments (chaplets) from grave 21 (top) and grave 93 (bottom) from the Boksto cemetery, Vilnius.( R. Jonaitis & I. Kaplūnaitė/Antiquity Publications Ltd)

Professor Giedrė Motuzaitė Matuzevičiūtė, the study’s lead author from Vilnius University and the Lithuanian Institute of History, stated:

“Human remains preserve remarkable information about mobility, diet and social interaction that cannot be detected through archaeology alone. By combining archaeological and historical investigations with multi-tissue isotope analysis of human osteological remains, we can, for the first time, directly identify individuals who migrated into medieval Vilnius during the city’s earliest formation. This research shows that Vilnius was already a highly diverse and internationally connected city from the very beginning of its history.”

Dr. Rytis Jonaitis of the Lithuanian Institute of History, a co-author of the study, added that archaeologists had long theorized that migrants from Ruthenian territories resided within the Civitas Ruthenica community. The isotopic evidence now delivers concrete proof that certain individuals buried at Bokšto Street originated from regions far beyond the borders of Lithuania.

Rethinking Medieval Cities and Their Origins

The research challenges long-standing assumptions about the insularity of medieval pagan societies. Despite the Grand Duchy of Lithuania’s official pagan status, its capital was already deeply intertwined with neighboring regions through trade, population movement, and cultural exchange. The study also raises broader questions about why people moved to Vilnius, with potential catalysts including diplomatic alliances, burgeoning trade networks, religious mobility, and large-scale population displacements triggered by the devastating Black Death pandemic, which swept through much of Europe in the mid-14th century.

The Bokšto Street cemetery represents one of the largest known medieval Christian burial grounds in pagan Lithuania. During the 13th and 14th centuries, while the state formally adhered to paganism, those buried there followed Orthodox Christian rites. The study’s senior author, Professor Rimantas Jankauskas of Vilnius University’s Faculty of Medicine, underscored that the findings reinforce the idea that medieval cities were centers shaped by mobility, cultural interaction, and adaptation — a truth that modern analytical methods are only now making fully visible.

Bokšto Street in Vilnius Old Town, where the medieval cemetery was excavated. (Augustas Didžgalvis / CC BY-SA 4.0 / Wikimedia Commons)

The study ultimately reveals that the roots of Vilnius as a multicultural and multi-confessional city stretch back to its very founding. Long before the Christianization of Lithuania in 1387 under Grand Duke Jogaila, the city was already a meeting point of faiths, peoples, and cultures. The evidence from Bokšto Street suggests that the story of medieval Vilnius is far richer and more cosmopolitan than previously imagined, and that isotope science is proving to be an indispensable tool for recovering the hidden lives of people who left no written record.

Top image: Grave goods from the cemetery, largely of Byzantine style and associated with Orthodox Christianity.  Source: Algis Blažys & Rytis Jonaitis/Antiquity Publications Ltd