Genetic study On the Edge of Empire: Paleogenomic Insights into Roman Dacia

[Tautalus]

Abstract

The Roman province of Dacia, located north of the Danube frontier, represented a key zone of cultural and demographic interaction during the Imperial period. However, the biological impact of Roman colonization in this region has not been characterized using genomic data. Here, we analyze genome-wide data from 34 individuals recovered from the Apulum-Dealul Furcilor necropolis, one of the largest funerary complexes in Roman Dacia. The genome-wide data reveal pronounced genetic heterogeneity within this population, reflecting its position at the intersection of Eastern Europe, the Mediterranean, and West Asia. Notably, we observe a sex-biased pattern of ancestry. Female individuals show stronger affinities to Eastern European, Steppe, and Caucasus-associated populations, suggesting the persistence of local or regionally connected genetic lineages. In contrast, male individuals display closer genetic relationships with Mediterranean and North African groups, including populations associated with Roman and Punic contexts, indicating male-mediated gene flow linked to long-distance mobility. These findings highlight the complex demographic processes shaping Roman frontier communities, where local and incoming populations were integrated through asymmetric social dynamics. Our results provide genomic evidence consistent with sex-biased admixture in Roman Dacia and underscore the role of frontier regions as hubs of genetic and cultural interaction within the Roman Empire.
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https://www.biorxiv.org/content/10.64898/2026.04.18.719386v1

 

[Riverman]

Well, the Roman Dacia paper is out and once more its a disappointment to some degree, first and foremost because of the number of male samples and secondly the resolution. There is just one confirmed E-V13, which happens to be basal...I hope someone can get a more downstream assignment of him.
The second interesting individual has https://www.yfull.com/tree/R-Z645/ - so he looks Scytho-Sarmatian, which already points to a non-Dacian setting, rather.

One is R1b: https://discover.familytreedna.com/y-dna/R-P297/tree

But the resolution is again an absolute catastrophy.

And one being assigned to A1b, whether that's due to the catastrophic coverage or a real African I don't know.

That's most definitely not a breakthrough, being saved from an absolute failure by the one E-V13 we get (DB_M73). Which makes me wonder whether the cremation bias was still active to get to this kind of result.

From the supplement - which kind of coincides nicely with the fresh batch of Dacians South of the Danube from 1800 BP we got from the Akbari samples:

The famous visual representation of the war on Trajan’s column corroborates the
literary tradition of captivity and enslavement of Dacian prisoners on a large scale18. Conscription
into Roman auxiliary units also took many more Dacian men of fighting age away from their homeland.

From the main text:

The genetic analysis of the ADF population from Roman Dacia provides insight into the240
demographic processes and cultural transformations that unfolded during the Roman conquest and241
subsequent colonization of the region. Our findings reveal a complex interplay of local Dacians,242
Roman settlers, and neighboring nomadic groups, which collectively shaped the genetic landscape243
of this frontier province.

That's what the uniparentals suggest too - going by the sites they investigated. Like Dacian (E-V13), Scytho-Sarmatian (R-Z93) and foreigners (like A1).

Our results reveal273 contrasting male and female genetic ancestries, distinct patterns of genetic affinity, and the274
enduring impact of both Roman- and Steppe-related lineages. The ADF_f individuals (females)275
exhibit strong genetic affinity with Steppe-related and Central Asian Iron Age populations. This276
pattern is consistent either with the integration of females from these groups into local Dacian277
.CC-BY-ND 4.0 International licenseavailable under a
(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made
The copyright holder for this preprintthis version posted April 21, 2026.;https://doi.org/10.64898/2026.04.18.719386doi:bioRxiv preprint
11
communities or with the persistence of local female lineages that already carried genetic affinities278
to Steppe-Central Asian populations prior to the Roman conquest. The dominance of Component279
2 in ADF_f individuals, which is strongly represented in Steppe and Central Asian populations,280
indicates a substantial contribution of Steppe-related ancestry to the female genetic profile in ADF.

Note the samples come mostly from https://de.wikipedia.org/wiki/Apulum which was at the Dacian limes and is therefore expected to have increased foreign and Roman presence compared to the province in general.

Our data show that the ADF_f individuals show a strong genetic connection to populations from307
the Caucasus, particularly Armenia, which represented the last great effort of Rome to bring the308
Pontic area under control. This suggests that the Caucasus region could have served as a genetic309
corridor linking Eastern Europe and Western Asia, facilitating the movement of peoples and genes310
into Roman Dacia32. The high outgroup f3-statistics values between ADF_f and Caucasus311
populations indicate a deep ancestral connection, possibly reflecting gene flow or shared ancestry312
with Armenian Highland groups during the Late Bronze Age and Iron Age. Similarly, the ADF_f313
individuals show significant genetic affinities with Eastern European and Steppe populations, such314
as Russia_LBA, Moldova_LBA, and Tajikistan_Ksi. This supports the idea that Steppe-related315
ancestry was a major component of the Dacian gene pool, likely introduced through interactions316
.CC-BY-ND 4.0 International licenseavailable under a
(which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made
The copyright holder for this preprintthis version posted April 21, 2026.;https://doi.org/10.64898/2026.04.18.719386doi:bioRxiv preprint
12
with Scythian or Sarmatian groups before its conquest by the Romans33. The Sarmatians, in317
particular, were known to have inhabited the Pontic-Caspian Steppe and Carpathian regions34, and318
their genetic influence on Roman Dacia is evident in the ADF_f individuals’ genetic profile.

The whole conclusion just sums up that they by and large have sampled a Sarmatian community, instead of an actual Dacian one...

Plus incoming foreigners:

In contrast, the ADF_m (male) individuals show a more heterogeneous genetic profile, with320
significant contributions from Mediterranean and North African populations, as indicated by the321
elevated Component 1 and Component 3 in the admixture analysis. This suggests that male-322
mediated gene flow from Roman settlers and Mediterranean populations was a key factor shaping323
the genetic makeup of Roman Dacia. The presence of Component 3, which is rare in Steppe and324
Central Asian groups, but common in Punic- and Phoenician-associated populations, further325
supports the idea that male ancestors of the ADF population may have originated from326
Mediterranean sources. This is consistent with historical accounts of Roman colonization of the327
area, which often involved the settlement of Roman soldiers and veterans from diverse regions of328
the Roman Empire in newly conquered territories35.

The genetic diversity of the ADF sample also reflects the cultural and genetic complexity of Roman Dacia, which served365
as a frontier region at the intersection of Roman, Dacian, and nomadic influences. The Roman366
conquest and subsequent colonization of Dacia likely facilitated the integration of diverse genetic367
components into the local population, resulting in a heterogeneous genetic landscape that persisted368
even after the Roman withdrawal in 271 CE51.

So instead of Dacians, we got Sarmatian females which mixed with incoming Romans in a Romanised site. Unfortunate.

The whole site choice was a failure - unless they wanted to sample the most multe-ethnic setting, which probably was the choice by default. At least they admit it:

We acknowledge that the observed sex-biased signals may be influenced by sampling bias or necropolis-specific structure, and therefore424

should be interpreted with caution. In particular, a single necropolis, particularly in a context such425
as Apulum that likely included a high proportion of incomers, may not be representative of Roman426
Dacia as a whole.

Abotu the site:

Archaeological research identified two large bi-ritual necropolises, with inhumation and cremation
burials coexisting without topographical separation in Apulum, present-day Alba Iulia, Romania
(Figure 6)73–75. They have been used throughout the 2nd and 3rd centuries CE: the northern445
necropolis in the Stadium area and the southern necropolis on Dealul Furcilor (also known as446
Forks Hill or Podei)76,77. These necropolises align with the Roman custom of placing burial447
grounds along roads outside urban centers. Among these, the Alba Iulia-Dealul Furcilor (ADF)448
necropolis, spanning 35 hectares, stands out as the largest known funerary complex in Dacia, with449
only 20-25% excavated by the year 2011, and 1,243 in-situ burials recovered by 2018, yet it450
remains incompletely explored

https://www.biorxiv.org/content/10.64898/2026.04.18.719386v1.full.pdf

Let's look whether there is something local Dacian in this set at all...

 

[Tautalus]

"The genetic diversity of the ADF sample also reflects the cultural and genetic complexity of Roman Dacia, which served as a frontier region at the intersection of Roman, Dacian, and nomadic influences. The Roman conquest and subsequent colonization of Dacia likely facilitated the integration of diverse genetic components into the local population, resulting in a heterogeneous genetic landscape that persisted even after the Roman withdrawal in 271 CE...."
"These observations underscore the Empire’s capacity directly and indirectly to reshape both the cultural and, as argued here, the genetic makeup of its provinces through both structural and biological means, offering valuable insights into the mechanisms of Imperial cohesion and legacy."​

Saying that the Empire reshaped the genetic makeup of Roman Dacia based on 34 individuals, with only 14 usable for population genetics, from a single necropolis, is an overgeneralised claim. To support that claim properly, they would need multiple sites across Dacia (rural and urban) and larger sample sizes.
The evidence supports some local complexity, but not necessarily a province wide transformation, rural Dacia was probably very different.
The authors want to present the study as having broader relevance but they themselves do acknowledge the limitations, nothing that the sample may not be representative and classifying it a “preliminary framework”.

 

[Riverman]

We have the usual problem in the Dacian sphere of the locals being overwhelmingly cremated. This is even true in areas like Viminacium, in a later period, when a large fraction of the local population still got cremated, which causes inevitable some distortion.

In this case at Apulum we really have a soldier's camp type of scenario, with many legionaries, auxiliaries and foederati. In my opinion the odd kind of mixture for the region comes from the transnational soldiers the Romans brought interacting with the Sarmatian foederati. Essentially, there is almost nothing local involved in this setting.