---
title: "Bulgarian DNA: ancient origins where Thrace met the Slavic and Bulgar arrivals"
description: "Ancient DNA on Bulgarian ancestry: the Thracian-era Balkan base, the Roman provincial centuries, the measured Slavic-era layer, the surprisingly thin Bulgar trace — and how to read a Bulgarian genome."
canonical: https://www.ancestrify.io/blog/bulgarian-dna-ancient-origins
date: 2026-08-31T13:32:00+00:00
updated: 2026-09-09
author: "Andi Thomaj"
---

# Bulgarian DNA: ancient origins where Thrace met the Slavic and Bulgar arrivals

What are the ancient origins of Bulgarian DNA? A Thracian-era Balkan base carried through the Roman provinces, plus the early medieval East European layer that the peninsula transect measures at a large minority to roughly half by region. The Turkic Bulgars who named the country register as a small trace. Ancestrify models each era from your raw DNA.

Bulgaria is named for the one founding people who contributed least to its genome. The Bulgars
gave the state its name and its first dynasty; the language is Slavic; and the genetic base under
both is the old population of Thrace, carried through Rome's Balkan provinces. Ancient DNA — with
the Balkans now among Europe's best-sampled regions — can put rough weights on all three.

> **The short answer:** Bulgarian ancestry is the Balkan deep stack — Thracian-era locals shaped
> by farmer, steppe and provincial-Roman layers — plus the early medieval East European (Slavic-
> era) addition the peninsula-wide transect measures at a large minority to roughly half by
> region. The Turkic Bulgars register as a small steppe trace at most. Modern Bulgarians sit
> centrally in the Balkan cluster, closest to North Macedonians, Romanians and Serbians.

## Thrace, and the province

The territory runs the [Balkan deep sequence](/blog/ancient-balkan-dna-roman-slavic-migrations)
from the front row: Europe's first farming societies (Karanovo), spectacular Copper Age wealth
(the Varna cemetery's gold, the oldest known), early [steppe-derived](/blog/yamnaya-dna-steppe-origins)
arrivals across the Danube plain. By the Iron Age the land was **Thracian** — the Odrysian
kingdom's world — and its sampled genomes carry the settled Balkan blend of farmer, steppe and
local forager legacies, kin to [the Daco-Getic north](/blog/romanian-dna-ancient-origins) and the
palaeo-Balkan west.

Rome made Thrace and Moesia core provinces, and the Balkan transect (Olalde et al. 2023) shows
what provincial status meant genetically: continuous **Anatolian and eastern-Mediterranean**
inflow through the imperial centuries — the same cosmopolitan drift measured
[across the frontier](/blog/roman-frontier-dna-after-rome) — over a persistent local base.

## The two arrivals, weighed

The early Middle Ages brought both founding arrivals within two generations of each other, and
the genetics now separates them cleanly:

- **The Slavic-era layer is large.** The transect measures East European-related ancestry
  entering the Balkans at scale from the sixth century — in the eastern Balkans a large minority
  of ancestry, with regional values ranging toward half. In Bulgarian genomes it is the second
  pillar, fused with the provincial base — the same
  [proxy-dependent figure every Balkan estimate carries](/blog/albanian-dna-ancient-origins).
- **The Bulgar layer is thin.** Sampled elite burials associated with the early khanate carry the
  expected mixed steppe profiles (Turkic-era Central Asian blends), but their contribution to the
  broader population reads as small — a ruling minority absorbed within centuries,
  [the Hungarian conquerors' story](/blog/hungarian-dna-ancient-origins) with an earlier date and
  a linguistic twist: here the *newcomers* lost their language to the majority.

Ottoman centuries added regional texture (strongest in communities with documented conversion and
settlement histories — the Pomaks read genetically as local Bulgarians, incidentally, not as
settlers) without moving the national centre. Modern Bulgarian genomes sit centrally Balkan:
closest to North Macedonians (near-identical in most panels), then Romanians, Serbians and
northern Greeks. Y-DNA carries the balance sheet: [E-V13](/lab/y-haplotree/e/e-v13) and
[J-L283's J2b kin](/lab/y-haplotree/j/j-l283) for the palaeo-Balkan share,
[I2a-Dinaric](/lab/y-haplotree/i/i-p37) and [R1a](/lab/y-haplotree/r/r-m417) for the Slavic-era
one, [R-Z93-adjacent traces](/lab/y-haplotree/r/r-z93) for the steppe visitors.

## Reading your own results

- **[G25 distances](/lab/g25-distance):** modern era led by Bulgarian and North Macedonian
  averages with the Balkan neighbourhood tight behind;
  [expect near-ties](/blog/g25-closest-populations-explained) — this is one of Europe's most
  compact regional clusters. Ancient eras: provincial-cosmopolitan company in Antiquity, Thracian-
  era Balkan samples deeper.
- **[Admixture fits](/lab/admixture):** the Balkan two-source medieval structure (provincial base
  + Slavic-related) is mandatory panel design here;
  [collinear Balkan sources](/blog/g25-source-selection-overfitting) are the standing trap, and a
  small steppe-nomad component should be treated as noise unless
  [formally tested](/blog/qpadm-vs-global25).
- **[qpAdm](/qpadm):** two crisp questions — *what Slavic-era weight does my genome require?* and
  *does it need any Bulgar-like steppe source at all?* The second usually answers no
  [with a clean rejection](/blog/why-qpadm-models-get-rejected), which is itself the historically
  interesting result.

## Frequently asked questions

### Are Bulgarians Slavs or Bulgars genetically?

Mostly neither-alone: the largest share is the old Balkan provincial base, the Slavic-era layer
is the major addition, and the Bulgars are a trace. The name and the language each came from a
different pillar than the plurality of the ancestry — the Balkans in one sentence.

### How much Thracian ancestry do Bulgarians have?

A substantial share via the provincial continuum — but "percent Thracian" is not a well-posed
number: Thracians were themselves a blend, and later layers fused with theirs.
[Formal models](/qpadm) can weigh era-sources; they cannot resurrect a census.

### Are Bulgarians close to Turks genetically?

Closer than politics suggests and further than geography might: Anatolian Turks carry
[the old Anatolian pool](/blog/anatolian-turks-genetic-making), Bulgarians the Balkan one — the
two share deep Mediterranean-Anatolian layers while differing in the Slavic-era and Central
Asian additions respectively.

Terms used here are defined in the [glossary](/glossary).

## Sources and further reading

1. Olalde, I. et al. (2023). A genetic history of the Balkans from Roman frontier to Slavic
   migrations. *Cell*, 186, 5472–5485.
2. Mathieson, I. et al. (2018). The genomic history of southeastern Europe. *Nature*, 555,
   197–203.
3. Lazaridis, I. et al. (2022). The genetic history of the Southern Arc. *Science*, 377,
   eabm4247.