Archaeogenomics of Ancient Greek Colonies

Discovering Ancient Ties through DNA

The genetic affinities between ancient Greek colonies and their mother cities provide fascinating insights into the migration patterns and cultural transmissions of ancient civilizations. The study of Amvrakia, a significant Corinthian colony in western Greece, highlights these connections through advanced archaeogenomic techniques, revealing the complexity of ancient population movements.

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Historical and Archaeological Context

Founded in the 7th century BCE, Amvrakia was strategically situated by the Arachthos River in Epirus, in what is today Arta, Greece. This thriving settlement was closely tied to Corinth, which had established a trading post there as early as the 8th century BCE. The outpost linked southern Greece with the mainland of Epirus, paving the way for political and economic exchanges that shaped the colony's development and cultural identity.

The Corinthian colonization process, evident in the archaeological remains, stands as a testament to the interactions between the metropolis and its distant colonies. Excavations in Amvrakia and neighboring sites have yielded grave goods, pottery styles, architectural remnants, and skeletal remains, providing the basis for genetic study while also revealing strong Corinthian material culture influences.

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The Genetic Exploration

Through cutting-edge archaeogenomic research, scientists found that Amvrakia's founding population was influenced by migrations from two distinct sources. The first came from the Corinthian territory, echoed by the Tenea population during the Archaic period. The second derived from local populations of the Late Bronze Age at nearby sites such as Ammotopos, creating a notable genetic confluence.

Genomic analysis of remains from both Amvrakia and Archaic Tenea suggests shared ancestry and clear evidence of population movement from Corinth to Amvrakia. The genetic pool of this ancient colony represents a blend of Corinthian migrants and indigenous Greek populations, demonstrating the complexity of ancient colonization processes.

Analyzing Ancient Genetic Links

Comprehensive genetic analyses revealed shared Identity By Descent segments between individuals from Amvrakia and Tenea, providing molecular evidence for their common origins. This connection strongly supports historical accounts of Amvrakia's dependency on, and close ties with, Corinth. The shared genetic legacy points to both cultural and biological mixing at the foundation of Amvrakia, contributing to its regional identity.

The study examined genetic material from 24 individuals from Amvrakia, spanning from the Archaic to Hellenistic periods and offering a valuable temporal perspective on population dynamics. Among the discoveries were family relationships, including sisters and their kin, and even a mother-and-son pair from Tenea, placing individual lives within the broader story of colonization.

Population Evolution Through Time

In subsequent periods, the population of Amvrakia exhibited slight genetic differentiation while maintaining continuity with its Corinthian-linked origins. This suggests an evolving demographic landscape shaped by both indigenous and Corinthian inputs through the Classical and Hellenistic eras.

During the Classical period, despite some differentiation from the Archaic population, strong indicators of continuity remained. Genetic markers also revealed local inbreeding practices within restricted social circles, in line with historical records. As Amvrakia moved into the Hellenistic period, it developed into a bustling cultural hub, drawing influences from across the Mediterranean world.

Physical Characteristics and Daily Life

The genetic analysis painted a portrait of Amvrakia's ancient inhabitants, suggesting a population with predominantly brown eyes and hair, alongside intermediate skin tones typical of Mediterranean populations. Interestingly, none of the ancient individuals showed lactose tolerance, indicating that dietary adaptations common today developed much later.

Beyond ancestry, the research also offered glimpses into health. While systemic pathogens were not detected in the skeletal remains, DNA from oral bacteria linked to severe periodontal disease was identified, providing insight into diet and oral hygiene in these communities.

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Cultural and Genetic Synthesis

The colonization of Amvrakia represented more than a simple transplantation of Corinthians into a new territory. Instead, it involved a synthesis of cultures and genes, producing a distinctive regional identity that retained connections to both Corinthian heritage and local Greek traditions. The genetic flow from Corinth, combined with local inputs at the colony's foundation, reflects a broader pattern of interaction and exchange.

Archaeological evidence from grave sites reveals close genetic connections between local populations and Corinthian migrants, suggesting that the initial genetic pool of Amvrakia was shaped by both groups. Over time, this landscape evolved gradually, with Corinthian settlers contributing significantly to the founding genome while intertwining with existing local populations.

https://www.biorxiv.org/content/10.1101/2025.07.01.662689v1

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