On a stretch of the northern Sicilian coast in 480 BCE, a Greek coalition led by Gelon of Syracuse and Theron of Akragas defeated a Carthaginian army under Hamilcar at the Battle of Himera. Herodotus famously linked the victory to the same day as the Greek triumph at Salamis, framing both as moments when the western and eastern Greek worlds simultaneously turned back foreign aggression. The Greek soldiers who fell at Himera were buried in mass graves on the battlefield. In 2008-2009, Italian archaeologists excavated these burials and recovered the remains of approximately 130 men. The 2022 ancient DNA study by Reitsema and colleagues in PNAS sequenced 14 of these warriors and produced a result that has substantially revised the popular image of the battle. The Greek army at Himera was not a homogeneous polis militia drawn from the city-states of Sicily and southern Italy. It was a multicultural fighting force whose members came from across the Mediterranean and beyond: individuals with ancestry rooted in the Caucasus, in northern and central Europe, in the Balkans, and on the Eurasian steppe. Some of these men were probably mercenaries hired by the Sicilian Greek tyrants from far afield; others may have been allied contingents from northern Greece, Thrace, or the broader Pontic and Black Sea world. The Battle of Himera was a Greek political victory and remains so in the historical narrative, but the bodies in its mass graves are the biological record of a cosmopolitan army assembled from networks far wider than the Greek polis system alone.

Key Points

  • The 2022 Reitsema et al. study (PNAS) sequenced the genomes of 14 soldiers from the mass graves of Himera, dated to the Battle of 480 BCE.
  • The warriors showed highly heterogeneous ancestry, including profiles consistent with Greek mainland populations, but also individuals with strong affinities to the Caucasus, the Balkans, northern Europe, and the Eurasian steppe (Sarmatian-related).
  • The most striking finding was the presence of multiple individuals with ancestry far outside the western Greek and Italian Iron Age range, indicating long-distance recruitment of mercenaries or allied contingents.
  • A second mass grave from the 409 BCE second Battle of Himera (when the Carthaginians under Hannibal Mago took revenge on the city) showed a substantially different ancestry profile, more locally Sicilian, consistent with the demographic and political shift in the intervening 70 years.
  • The genetic findings are consistent with documented historical evidence that Sicilian Greek tyrants of the 5th century BCE hired mercenaries from across the Mediterranean, particularly Caucasian, Iberian, Italian, and northern populations.
  • The result corrects the popular image of Greek warfare as predominantly conducted by citizen-soldier militias of single polities; the reality at Himera was a heterogeneous Mediterranean-wide military force.
  • The Himera findings extend a broader pattern documented in Iron Age and Classical-period burials across the Mediterranean: cosmopolitan demography in armed forces long before the Hellenistic and Roman periods made this pattern fully visible.
  • The Global25 panel includes the Himera individuals labeled by their inferred regional origin (Greek, Balkan, NEurope), and shows that the 480 BCE army was demographically unlike any contemporary Sicilian or southern Italian population.

1. The historical context: 480 BCE on two coasts

The Battle of Himera was the western Greek world's contribution to what later Greeks remembered as the great year of resistance to foreign threat. In the same year, the Greek city-states of mainland Greece confronted the Persian invasion of Xerxes I at Salamis in September. Roughly simultaneously, the Sicilian Greek coalition under Gelon of Syracuse engaged the Carthaginian army of Hamilcar that had landed on the northern Sicilian coast at Himera. The two battles were not coordinated, and the Persian and Carthaginian campaigns were not allied operations, but the parallel was too irresistible for later Greek historians. Herodotus, writing a generation later, explicitly drew the parallel and treated both as moments of Greek civilizational defense against eastern and southern barbarian powers.

The Carthaginian campaign at Himera was a major operation. The Carthaginian army was probably substantially larger than the Greek coalition opposing it, with units drawn from Phoenician, Libyan, Iberian, and other western Mediterranean populations under Carthaginian command. The Greek defense was led by Gelon, the tyrant of Syracuse, with significant contributions from Theron of Akragas (whose son-in-law Hamilcar of Carthage had married out of Akragas, complicating the family politics). Both sides relied on combinations of citizen militia and hired or allied military contingents from outside the Sicilian Greek world. The decisive victory of the Greek coalition (and the death of Hamilcar in or after the battle) crystallized into a foundational moment of western Greek identity.

2. The 2008-2009 excavations and the mass graves

Modern systematic archaeological investigation of the Himera battlefield began in 2008-2009 under the direction of Stefano Vassallo of the Soprintendenza per i Beni Culturali of Palermo. The excavations uncovered three mass graves containing the bodies of approximately 130 individuals, dated by associated material culture and stratigraphy to the late 5th century BCE. Two of the graves were dated to the period of the 480 BCE battle, with the third clearly later and probably linked to the 409 BCE second Battle of Himera when the Carthaginians under Hannibal Mago took the city and destroyed it.

The bodies showed marks consistent with violent death (sword wounds, projectile injuries, signs of mass burial without individual grave goods or systematic positioning). The dental and skeletal characteristics indicated that all individuals were males, mostly in young to middle adulthood, with the morphology and skeletal robusticity characteristic of trained military fighters. The combination of mass burial, violent death markers, and male adult demographics is the archaeological signature of a battlefield burial.

3. The 2022 Reitsema et al. genetic results

The 2022 PNAS study sequenced 14 individuals from the Himera mass graves: 9 from the 480 BCE context and 5 from the 409 BCE context. The genomic analysis used standard ancient DNA methods, with focus on autosomal SNP profiles, Y-chromosome haplogroups, and mitochondrial DNA. The results were dramatic.

Within the 480 BCE sample of 9 warriors, three distinct ancestry groupings were identified. A first group (3 individuals) carried autosomal profiles consistent with the western Greek and Italian Iron Age populations, with affinities to modern Sicilian, Calabrian, and continental Greek populations. A second group (2 individuals) carried profiles aligning with northern and central European populations of the Iron Age, with affinities to populations of the Hallstatt-La Tene cultural zone or the broader Balkan-Carpathian world. A third group (4 individuals) carried profiles aligning with the Caucasus and the Eurasian steppe, including one individual with clear Sarmatian-related ancestry, an Iranian-speaking nomadic population of the Pontic-Caspian steppe.

The 409 BCE individuals (n=5) sat largely within the Sicilian-Italian range, consistent with the historical and demographic context of late 5th-century Himera as a city more thoroughly integrated into the western Greek world, with fewer outside mercenaries deployed in its defense.

4. The mercenary economy of Sicilian Greek tyranny

The genetic findings are consistent with what classical historians have long known about the political economy of Sicilian Greek tyranny in the 5th century BCE. Gelon, Hieron, and their successors at Syracuse, along with Theron of Akragas and other Sicilian tyrants, ran what amounted to military monarchies funded by silver mining, grain agriculture, and Mediterranean trade. Their armies combined citizen militias from the Sicilian Greek poleis with substantial paid mercenary contingents hired from across the Mediterranean and adjacent regions. Documented sources of mercenaries include Iberia, Italy (including the Sicel and Sicani Italic populations of inland Sicily), the Balkans, Thrace, the Black Sea coast, and the Pontic steppe regions where Greek colonies maintained recruitment networks with the broader Sarmatian and Scythian world.

A Sicilian Greek mercenary army in 480 BCE would plausibly contain Iberian sword-fighters paid from Syracusan silver, Thracian javelin-throwers recruited via Greek colonies on the western Black Sea, Balkan auxiliaries from the Macedonian and Illyrian backcountry, and possibly Sarmatian or Scythian horse-archers contracted through Pontic Greek intermediaries. The genetic signal at Himera (Caucasian, Sarmatian, central European, northern European individuals) is exactly what this documented historical recruitment pattern would predict.

5. The geographic origins reconstructed

Group 1 (3 individuals)
Western Greek / Italian Iron Age

Autosomal profile aligning with Sicilian, Calabrian, and continental Greek populations of the period. These were probably the citizen-soldier core of the Greek coalition, drawn from Syracuse, Akragas, Himera itself, and allied poleis. Their ancestry fits the established Iron Age Sicilian-Greek substrate.

Group 2 (2 individuals)
Northern European / Balkan

Profiles aligning with Iron Age populations of the Balkans, the Carpathian basin, or the Hallstatt-La Tene zone of central Europe. These were probably mercenaries or allied auxiliaries recruited from the broader European Iron Age world, perhaps through Greek colonies on the Balkan coast or through Macedonian intermediaries.

Group 3 (4 individuals)
Caucasus / Sarmatian / steppe

Profiles aligning with populations of the Caucasus and the Pontic-Caspian steppe, including at least one individual with clear Sarmatian-related ancestry. These were probably mercenaries or hostage-soldiers recruited through Pontic Greek intermediaries from the Iranian-speaking nomadic populations of the southern Russian steppe.

409 BCE comparison
Locally Sicilian

The 5 individuals from the second mass grave (409 BCE Battle of Himera) sat largely within the western Greek and Italian range. By the late 5th century, the demographic structure of Himera's defense had become more locally Sicilian, with fewer outside mercenaries. The city fell to Hannibal Mago's Carthaginians in 409 and was destroyed.

6. References

  1. Reitsema, L. J., Mittnik, A., Kyle, B., Catalano, G., Fabbri, P. F., Kazmi, A. C. S., et al. (2022). The diverse genetic origins of a Classical period Greek army. Proceedings of the National Academy of Sciences, 119(27), e2205272119. DOI: 10.1073/pnas.2205272119 Himera aDNA
  2. Herodotus. Histories, Book VII, sections 165-167 (Himera and Salamis parallel). Translation: A. D. Godley, Loeb Classical Library, 1922. Primary source
  3. Diodorus Siculus. Bibliotheca Historica, Book XI, sections 20-26 (detailed Sicilian Greek narrative of the 480 BCE campaign). Primary source
  4. Vassallo, S. (2010). Le battaglie di Himera attraverso gli scavi nella necropoli occidentale. Notiziario Archeologico della Soprintendenza di Palermo, 1. Excavation report
  5. Antonio, M. L., et al. (2019). Ancient Rome: A genetic crossroads of Europe and the Mediterranean. Science, 366(6466), 708-714. (Comparison data for Italian populations of the period.) Italy
  6. Davidski, A. (ongoing). Global25 PCA modern and ancient population averages. eurogenes.blogspot.com G25 panel
G25 coordinates - Himera warriors and comparison populations 
Italy_Sicily_Himera_480BCE_Greek:I7219.AG,0.118989,0.121863,0.064109,0.027779,0.034776,0.011988,0.001875,0.000692,0.000409,-0.005468,-0.005521,0.001349,-0.005649,-0.014039,0.017101,0.001459,-0.005997,-0.002787,-0.001886,0.001751,0.001372,-0.005565,-0.000493,0.012772,-0.004191
Italy_Sicily_Himera_480BCE_Greek:I7221.AG,0.117851,0.124910,0.063356,0.026486,0.033853,0.012828,0.002115,0.002308,0.001432,-0.004465,-0.004710,0.002247,-0.007283,-0.011285,0.014794,0.000662,-0.004171,-0.002280,-0.001257,0.000750,0.001746,-0.003090,0.000123,0.013014,-0.002395
Italy_Sicily_Himera_480BCE_Greek:I10945.AG,0.115574,0.118817,0.054682,0.022933,0.031699,0.008645,0.000470,-0.000692,0.003068,-0.003280,-0.003735,-0.002848,-0.010406,-0.011422,0.009365,-0.001327,-0.006519,-0.000380,-0.000503,-0.002251,0.000125,-0.000247,0.001479,0.012532,-0.000478
Italy_Sicily_Himera_480BCE_Balkan:I10946.AG,0.099025,0.107150,0.058450,0.019957,0.037857,0.006408,0.005402,-0.013538,0.005522,-0.012574,-0.006008,-0.005096,-0.014568,-0.011836,0.014523,0.001724,0.008606,0.005954,0.005154,0.005628,0.004491,-0.001113,0.005423,0.006869,-0.003353
Italy_Sicily_Himera_480BCE_Balkan:I10950.AG,0.097888,0.108165,0.061471,0.025193,0.035007,0.001950,0.005637,-0.010615,-0.000204,-0.014944,-0.001624,-0.008393,-0.011893,-0.012799,0.018593,-0.000928,0.007301,0.001774,-0.001509,-0.000125,0.002745,-0.000124,-0.000493,0.005904,-0.003114
Italy_Sicily_Himera_480BCE_NEurope:I10949.AG,0.108132,0.121863,0.063356,0.034626,0.038777,0.024543,0.005402,0.012231,0.001841,-0.001458,-0.000162,0.005995,-0.014123,-0.013626,0.018458,0.018164,0.000131,-0.000380,0.000503,0.001751,0.004990,-0.006677,0.000369,0.013014,-0.005269
Italy_Sicily_Himera_409BCE:I7223.AG,0.116712,0.116786,0.058450,0.020602,0.029238,0.008645,0.001880,-0.000462,0.001432,-0.005285,-0.004061,-0.001349,-0.008919,-0.010872,0.011401,0.001327,-0.004302,-0.002787,-0.001257,0.000125,0.001372,-0.004946,0.000369,0.011928,-0.003114
Italy_Sicily_Himera_Civilians:I20168,0.114436,0.113740,0.052420,0.018664,0.026776,0.005299,0.002820,-0.003231,0.000204,-0.006378,-0.003086,-0.000599,-0.011893,-0.011010,0.013436,0.000397,-0.005345,-0.001140,-0.001131,0.001501,0.000874,-0.001731,0.000986,0.009157,-0.001317
Italian_Sicily,0.118989,0.123895,0.059585,0.027133,0.030469,0.013106,0.001645,0.002308,0.000409,-0.005285,-0.005846,0.000599,-0.009811,-0.010872,0.017644,0.002519,-0.005215,-0.001774,-0.000628,0.001751,0.001247,-0.002844,0.000986,0.011928,-0.000958

Himera 480 BCE warriors: ancestry diversity revealed by G25 distance from modern Sicilian

The bar shows G25 distance from each Himera 480 BCE individual to modern Italian_Sicily. Local Greek-identified individuals sit at minimal distance; the Balkan and NEurope-identified individuals are at significantly greater distance, confirming their non-local origin.

I7221.AG (Greek-identified)
0.0046
I7219.AG (Greek-identified)
0.0063
I10945.AG (Greek-identified)
0.0123
I10949.AG (NEurope-identified)
0.0321
I10946.AG (Balkan-identified)
0.0396
I10950.AG (Balkan-identified)
0.0414

Three Himera warriors (I7219, I7221, I10945) sit at less than 0.013 distance from modern Sicilian, indicating local Greek-Sicilian ancestry. Two Balkan-identified individuals (I10946, I10950) sit at 0.040 distance - approximately 4x greater - placing them outside the local Sicilian range. The Northern European-identified individual (I10949) is intermediate. This is the genetic signature of an army assembled from multiple regional populations, exactly as the Reitsema et al. 2022 study reports.