Ancient migration into England did not happen all at once, but instead, people arrived gradually over many centuries, according to new research.
A recent bioarchaeological study published in Medieval Archaeology reveals that this movement continued from the end of Roman rule through the Norman Conquest, covering nearly 700 years, with people coming from different parts of Europe at different times and in varying numbers.
Researchers from the Universities of Edinburgh and Cambridge examined chemical signatures in ancient teeth and genetic data from early medieval cemeteries. Their results suggest that England was not isolated during this time. This challenges the idea that most migration occurred only during major events, such as political changes or invasions.
Tracking Movement Through Teeth
The team analyzed more than 700 chemical signatures from the tooth enamel of people buried in England between about AD 400 and 1100. Tooth enamel forms during childhood and does not change; therefore, it preserves chemical information from the food and water a person consumed as a child.
If the chemical signatures in the teeth do not match the local environment where a person was buried, researchers can infer that the individual moved to that area after childhood.
The researchers also compared this isotopic data with ancient DNA from 316 individuals. This approach allowed them to study both physical movement and genetic ancestry. According to the authors, this is the first large-scale study to combine these methods across early medieval England.
Movement Was the Norm, Not the Exception
The study shows that migration took place throughout the early medieval period, not just during a few major events. Although mobility increased during the seventh and eighth centuries, people continued to move into England both before and after this period.
Some individuals had origins in nearby regions such as Wales and Ireland. Others showed chemical signatures pointing to northwest Europe, the Mediterranean, and even colder northern areas as far as the Arctic Circle.
Although men moved more often overall, many women also migrated. Female movement was especially common in northeastern England, Kent, and Wessex. This means that migration often involved families and larger groups, not just small groups of men.
“Our study took a ‘big data’ approach to assess the narratives around early medieval migration,” said Sam Leggett, a historian and bioarchaeologist at the University of Edinburgh. “We see here that migration was a consistent feature rather than just tied to one-off events.”
Climate Signals in Human Remains
Some of the enamel data also showed changes in climate. The chemical patterns in tooth enamel matched known cold periods in the sixth and seventh centuries, like the Late Antique Little Ice Age, as well as warmer times linked to the Medieval Climate Anomaly.
During colder times, the team also identified individuals whose chemical signatures matched those of colder environments. While the study does not claim that climate was the main cause of migration, the authors suggest that environmental changes may have influenced when and where people moved.
These climate signals, found together with evidence of ongoing migration, support the idea that early medieval societies stayed connected even during times of environmental stress.
Comparing Biology With History
The team also compared their results with early medieval chronicles and other written sources that describe population movements in England. In some cases, the biological evidence matches these accounts, while in others, it adds new complexity.
Importantly, the increase in mobility during the seventh and eighth centuries happened after the time usually linked to large-scale Anglo-Saxon migration.
“We didn’t expect to see a spike in mobility in the seventh and eighth centuries,” said Susanne Hakenbeck, an archaeologist at the University of Cambridge. “This study also shows that Britain was never isolated from the continent.”
Overall, the evidence indicates that early medieval England developed through long-term migration rather than sudden population replacement. These communities stayed connected to wider European networks for centuries. The authors note that while isotopic data can be used to trace movement, it does not always reveal exact migration routes.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds a Master of Business Administration, a Bachelor of Science in Business Administration, and a Data Analytics certification. His work combines analytical training with a focus on emerging science, aerospace, and astronomical research.