Ashkenazi Origins: Ancient DNA and Southern Italian Roots

Ashkenazi origins have a substantial Southern Italian connection, and ancient DNA gives that connection historical depth.

The relationship extends beyond modern populations occupying nearby positions on a PCA. In the comparisons assembled here, individuals from Imperial Italy, Late Antiquity, and medieval Italian communities repeatedly fall close to modern Southern Italians and Ashkenazi Jews. In several striking cases, the two groups alternate among an ancient individual’s nearest modern matches.

My argument is that this recurring affinity supports a substantial contribution from populations of ancient Italy to Ashkenazi ethnogenesis. Imperial Italy supplies an early setting in which relevant genetic profiles already existed; later Italian samples show related profiles appearing across subsequent centuries. The important observation is the recurrence of this relationship across places, periods, and paternal lineages.

In my earlier article, Ashkenazi Jews, PCA and Southern Italians: Shared Ancestry Until Jews Enter the Plot?, I examined modern Southern Italian, Ashkenazi, and Greek-island overlap. Here I move the discussion backward in time: what happens when actual ancient Italian genomes enter the comparison?

From modern overlap to ancient Italian genomes

My preprint, How Ashkenazi Origins Were Mis-modeled, argues that Southern Italian and Mediterranean reference populations belong at the center of this discussion. The ancient comparisons develop that argument by identifying individuals buried in Italy whose genetic affinities connect the populations under discussion.

The dataset below contains the 13 individuals assembled for this article. It is a selected comparison set, not a survey of every ancient Italian genome. Dates, lineage labels, component estimates, and population-distance results come from the collected Explore Your DNA sample records and calculators. A burial location establishes archaeological context; genetic affinity describes the genome. Neither alone identifies someone’s religion.

“Southern Italian” here describes the modern genetic comparison. The ancient individuals themselves come from several Italian regions, including central Italy and one northern site. An individual buried in Marche can have close affinity to present-day Campania or Calabria without being relabeled as someone excavated in southern Italy.

Ashkenazi origins and the Southern Italian pattern: all 13 individuals

The recurring relationship spans more than a millennium. It includes men and women, different regions, and multiple paternal branches. Some individuals lean clearly toward modern Southern Italians. Others sit at almost equal distances from Southern Italian and Ashkenazi references. That variation is part of the result.

The distance comparison: how close is close?

G25 distance measures separation in a 25-dimensional genetic coordinate system. Lower values mean closer positions within that system. These numbers are distances, not percentages of ancestry. Comparing two references against the same ancient individual makes the relative relationship especially easy to see.

Figure 1 compares the nearest listed Southern Italian and Ashkenazi references for the five individuals with exact paired values preserved in the supplied records. Every bar starts at zero and uses the same scale. The remaining eight individuals are included in Table 1 and Figure 2; their missing numeric distance pairs have not been reconstructed from descriptive summaries.

R835: an Imperial Italian with virtually equal affinities

R835, from Civitanova Marche, is the strongest Imperial example in this comparison. The catalog displays 136 CE as a summary date within a broader 27 BCE–300 CE interval. Ashkenazi Belarus is at 0.0235, Campania at 0.0238, and Calabria at 0.0239. The difference between the first two is just 0.0003.

The surrounding rankings reinforce the pattern: Ashkenazi Lithuania follows at 0.0242 and Ashkenazi Romania at 0.0245, with another Campania reference at 0.0249. Southern Italian and Ashkenazi references alternate within the same tight neighborhood. The observation is stronger than a vague statement that this individual looks broadly Mediterranean.

VEN006 and VK535: the relationship appears again

VEN006, dated 600–800 CE at Venosa, places Abruzzo at 0.0289, Ashkenazi Belarus at 0.0296, and Campania at 0.0300. Ashkenazi Lithuania, Calabria, and Ashkenazi Russia follow at 0.0310, 0.0312, and 0.0313. Once again, the closest references are interwoven.

VK535, from medieval Foggia, places Ashkenazi Ukraine at 0.0252 and Ashkenazi Belarus at 0.0256, ahead of Calabria at 0.0262. Ashkenazi Lithuania is at 0.0264, while the reported Campania entries are approximately 0.0264–0.0265. Here, the closest Ashkenazi references are slightly closer than the closest Southern Italian ones.

R107 and R1554 broaden the picture. They lean more clearly Southern Italian, showing that the collection contains a range of related profiles rather than thirteen copies of one intermediate individual. R136 adds the Cretan connection, while the supplied SGBN17 summary places Ashkenazi references first in another medieval Italian setting.

The Southern Italian connection crosses paternal lineages

The male samples include J1-P58, J2a-M67/L210, J2a-L70, J2b-L283, R1b-U152, R1b-Z2103, G2a-M406, G2a-L497, and E-V13. Their reported autosomal affinities cannot be reduced to one paternal branch.

A Y chromosome follows a single paternal line. Autosomal DNA reflects inheritance across many ancestral lines. Assigning an ancient Italian a Levantine or Jewish identity simply because he carries J1 or J2 skips the very evidence that needs examination: his wider genome and archaeological context. Equally, an R1b label does not establish an exclusively western European ancestry profile.

R835 and R1554 make this particularly clear. Both are Imperial-period men from Marche. R835 carries J1-P58; R1554 carries R1b-U152. Yet their modeled components run against a simplistic reading of those labels.

Natufian percentages do not measure Ashkenazi identity

R835 has the lowest modeled Natufian component in this collection, 4.0%, while being almost equally close to Ashkenazi and Southern Italian references. VK535 follows at 4.6% and places Ashkenazi references first. SGBN17 is listed at 4.8%, also with Ashkenazi references leading its reported ranking.

At the other end, R1544 has 11.6% and is described as closest to Calabria and Campania. R1554 has 10.9%, yet his closest listed modern population is Salentine Apulia. These examples directly undermine the idea that a larger Natufian estimate automatically means greater Ashkenazi affinity.

These components use deep prehistoric populations as modeling references. They are not a count of recent Judean ancestors, a religious classification, or a direct measurement of migration in the Roman period. The historical interpretation must come from the overall evidence rather than one ancient component label.

R1554’s Natufian estimate is approximately 2.7 times R835’s, despite R1554 carrying R1b-U152 and R835 carrying J1-P58. R835 also has the higher Steppe estimate. The lesson is straightforward: broad paternal labels cannot substitute for the autosomal comparison.

The maternal evidence: mtDNA belongs alongside Y-DNA and autosomal ancestry

The maternal lineages deserve the same attention as the paternal ones. The verified sample records include branches of H, J, T, and V. The Southern Italian–Ashkenazi autosomal relationship therefore appears among individuals carrying different maternal as well as paternal lineages. It cannot be reduced to one shared maternal haplogroup.

The showcase comparisons cross maternal branches too: R835 carries H2a5, VEN006 carries T1a, and VK535 carries T1a5. These are the three individuals whose supplied modern-distance results show particularly close Southern Italian and Ashkenazi matches. R1554, who leans more clearly Southern Italian, carries T2a1b1; R107 carries T2h. Their maternal assignments add another dimension to the comparison rather than repeating the Y-chromosome story.

The women: R1544, VK537, and SGBN17

R1544 carries mtDNA J1c. This woman from Imperial Lazio, dated 1–400 CE, has reported autosomal affinities placing Calabria and Campania ahead of Ashkenazi references. Her genome brings a female individual directly into the Imperial Italian comparison, with a documented maternal lineage alongside her Southern Italian affinity.

VK537 carries mtDNA V. This woman from medieval Foggia, dated 1000–1300 CE, has reported affinities linking Basilicata, Calabria, Campania, and Ashkenazi references. She represents a different maternal branch and a later Italian setting, while participating in the broader autosomal relationship examined here.

SGBN17, from medieval Sicily, adds another female genome. Her supplied autosomal summary places Ashkenazi references first, followed by Southern Italian and Mediterranean populations. Her mtDNA assignment remains unverified here, but her autosomal contribution to this comparison is independent of that missing assignment.

These women matter because the recurring genetic affinity is present in female as well as male individuals. R1544 and VK537 also document different maternal branches within that relationship. Their evidence belongs in the historical argument in its own right, alongside the men’s autosomal, paternal, and maternal results.

Mitochondrial DNA follows a single maternal line, just as Y-DNA follows a single paternal line. The argument comes from reading those lineages together with the wider genome, location, and date. These results document maternal diversity among the ancient Italian individuals under discussion; establishing a specific maternal founder connection to modern Ashkenazim would require matching the relevant downstream branches.

What Imperial Italy contributes to the origins argument

Ancient Italy contained substantial genetic diversity. Antonio and colleagues’ 2019 study of ancient Rome documented that diversity and substantial ancestry changes, including eastern Mediterranean immigration during the Imperial period. “Imperial Italian” therefore identifies a historical population setting with multiple ancestral inputs, not one uniform ancestry.

That setting matters for Ashkenazi origins. The relevant Southern Italian-like profiles did not have to emerge only in modern times: individuals with these affinities already occur in Imperial Italy. The later samples extend the geographical and chronological comparison into Venosa, Foggia, Sicily, and other Italian contexts.

The chronological spread demonstrates repeated occurrence, rather than a documented chain of descent between these particular skeletons. G25 proximity alone does not establish the direction or percentage of ancestry contributed. What it establishes here is the ancient presence of profiles closely related in genetic space to both modern comparison groups.

I regard that as strong support for taking ancient Italian populations seriously as contributors to Ashkenazi formation. The case becomes especially compelling when read alongside the wider genomic evidence discussed in my earlier PCA article. A historical explanation must account for the ancient comparisons as well as the modern overlap.

Ashkenazi origins: the Southern Italian evidence demands an explanation

The central observation survives the individual differences. R835, VEN006, and VK535 place Southern Italian and Ashkenazi references at nearly equal distances. Other individuals lean more clearly Italian while occupying a related Mediterranean neighborhood. The pattern crosses several paternal lineages and includes female genomes.

Calling every J-bearing individual a Levantine migrant does not explain it. Treating modeled Natufian ancestry as an ethnic identifier does not explain it. Dismissing the modern overlap as an isolated visual coincidence leaves the ancient comparisons unanswered.

My thesis is that Ashkenazi ethnogenesis drew substantially on populations rooted in Italy’s ancient Mediterranean genetic landscape. These comparisons strengthen that argument by showing relevant profiles in Imperial Italy and related affinities in later Italian communities. The Southern Italian connection belongs at the center of the discussion of Ashkenazi origins.

Sources and sample access

• Explore Your DNA: ancient sample catalog. Search the 13 IDs in Table 1; individual records provide archaeological information, lineage assignments, coordinates, and calculator outputs.
• Key records: R835, R1554, VEN006, and VK535.
• Steven Parker: earlier article on Ashkenazi–Southern Italian PCA overlap.
• Steven Parker: How Ashkenazi Origins Were Mis-modeled, preprint.
• Antonio et al. (2019): Ancient Rome: A genetic crossroads of Europe and the Mediterranean, Science.

Data note: Charts reproduce the collected calculator outputs supplied for this article; they are not newly calculated from raw ancient genomes. The site’s G25 results and component models are distinct from the analyses in the original ancient-DNA publications.