The Origins of Ashkenazi Jews: A Critical Examination of the Khazar Hypothesis and the Evidence for Roman-Era Roots
A Survey of Genetic, Historical, and Archaeological Scholarship
The origins of Ashkenazi Jews have been subject to competing theories, most notably the Khazar hypothesis and models emphasizing ancient settlement in the Roman Rhineland and Southern Italy. This article examines the current scholarly consensus through peer-reviewed genetic studies, ancient DNA analysis, and historical documentation. The evidence overwhelmingly supports a Levantine origin with significant Southern European admixture acquired during the Roman diaspora, while refuting the Khazar hypothesis on chronological, genetic, and historical grounds. The article also addresses the theological implications of genetic findings for Jewish identity and Christian-Jewish relations.
1. Introduction: The Controversy
The question "Where do Ashkenazi Jews come from?" might seem like academic trivia, but it carries enormous weight. The answer has been weaponized by antisemites to deny Jewish connection to the Land of Israel, exploited by political movements, and misunderstood by laypeople encountering genetic studies without proper context.
Two alternative narratives compete with the scholarly consensus:
1. The Khazar Hypothesis: Proposes that Ashkenazi Jews descend primarily from the Turkic Khazar Khaganate (8th–10th centuries CE), which allegedly converted to Judaism en masse.
2. The Roman-Era Diaspora Model: Emphasizes Jewish settlement in the Rhineland and Southern Italy during the Roman period, including the role of Jewish slaves as skilled artisans.
This article examines the evidence for both, with particular attention to recent peer-reviewed genetic studies that have revolutionized the field.
2. The Khazar Hypothesis: A Critical Examination
2.1 Historical Background
The Khazar Khaganate was a Turkic state in the North Caucasus and southern Russia that flourished between the 7th and 10th centuries CE. Contemporary sources, including the Reply of King Joseph and Arab historians such as al-Masudi and ibn Fadlan, suggest that elements of the Khazar nobility converted to Judaism, possibly as a political maneuver to maintain independence from both Byzantine Christianity and Islamic caliphates.
Arthur Koestler popularized the idea of mass Khazar conversion in his 1976 book The Thirteenth Tribe, arguing that Ashkenazi Jews descend primarily from these Turkic converts. The theory has since been adopted by various political movements seeking to delegitimize Jewish historical claims.
2.2 The Chronological Impossibility
The Khazar hypothesis faces a fatal chronological problem that is rarely acknowledged in popular discourse:
Jewish communities existed in the German Rhineland centuries before the Khazar state collapsed.
Archaeological and epigraphic evidence confirms Jewish presence in:
- Cologne (Colonia Agrippina): 2nd–3rd century CE [1]
- Mainz (Mogontiacum): 1st–2nd century CE [2]
- Worms (Borbetomagus): Early medieval period, with possible Roman antecedents [3]
These communities were part of the broader Roman imperial diaspora. As historian Leonard Rutgers notes, "Archaeologists have uncovered evidence of Jewish communities in Germanic provinces of the Roman Empire as early as the 300s C.E., particularly in what is today the city of Cologne." [4]
The Rabbi Moses Kalonymus migration from Italy to Mainz (circa 850–900 CE) is often mischaracterized as the "founding" of German Jewry. In reality, it represented a rabbinic reorganization and cultural reinforcement of communities that had existed for approximately 700 years. [5]
The Khazar state collapsed in 969 CE. If Ashkenazi Jews were Khazar refugees, one would expect their communities to appear in Eastern Europe after this date and migrate westward. Instead, the historical record shows the opposite: Jewish communities in Western Europe predate the Khazar collapse by centuries, with eastward expansion into Poland and Russia occurring only in the 12th–15th centuries. [6]
2.3 Genetic Refutation
2.3.1 Absence of Turkic or East Asian Ancestry
Multiple independent whole-genome studies have examined Ashkenazi Jewish ancestry. The consistent finding is approximately 50% Middle Eastern and 50% European ancestry, with zero detectable Turkic or East Asian components. [7][8][9]
Das et al. (2016), published in Genome Biology and Evolution, directly tested the Khazar hypothesis and concluded: "The so-called Khazar hypothesis is refuted by our analysis." [10] The study demonstrated that the "Khazar correlation" claimed by Elhaik (2012) was actually shared ancient Middle Eastern ancestry between Ashkenazi Jews and Caucasus populations, not evidence of Turkic descent.
2.3.2 Y-Chromosome Evidence
The Ashkenazi male line (Y-chromosome) tells an unambiguous story. The dominant haplogroups are:
- J1 and J2: Levantine/Semitic origin, shared with other Jewish populations and Levantine Arabs [11]
- E1b1b: North African/Middle Eastern origin [12]
- R1a (minor, 10-12%): European varieties, not Turkic lineages [13]
Rootsi et al. (2014) found that "Ashkenazi R1a branches are distinct from Turkic R1a lineages and instead match European or Middle Eastern varieties." [14]
2.3.3 Medieval DNA: The Erfurt Study
The 2022 study by Waldman et al., published in Cell, analyzed DNA from 38 medieval Jews buried in Erfurt, Germany (circa 1350 CE)—the first major ancient DNA analysis of a medieval Jewish population. [15]
The findings were definitive:
> "The comparisons suggested the Ashkenazi circa 1350 had a mix of ancestry resembling populations from southern Italy or Sicily today, with components found in modern Eastern Europe and the Middle East mixed in." [16]
No Khazar or Turkic signal was detected. The 14th-century Ashkenazim already carried the same genetic bottleneck signatures seen in modern Ashkenazim, meaning the founder event occurred centuries before the Khazar state's fall.
Harvard geneticist David Reich, co-author of the study, emphasized the implications:
> "These people lived about 25 generations ago, and an intermarriage rate with outsiders of more than one in 500 per generation would have shifted Ashkenazi ancestry by an amount we could detect. But that didn't happen. That's new information." [17]
2.4 Cultural and Linguistic Evidence
Beyond genetics and chronology, the Khazar hypothesis fails on cultural grounds:
- Yiddish, the historical Ashkenazi language, is a Germanic dialect with Hebrew and Aramaic elements—not a Turkic language. [18]
- Ashkenazi liturgy, folklore, and legal traditions contain no references to Turkic identity, Khazar history, or Central Asian geography. [19]
- The conversion described in historical sources appears to have been elite-only, not a mass population phenomenon. [20]
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3. The Roman-Era Diaspora: Evidence from History and Genetics
3.1 Jewish Slavery and Skilled Artisans in the Roman Empire
The Roman conquest of Judea produced mass enslavement, but Jewish captives were valued for specialized skills. Josephus records that after the First Jewish-Roman War (66–73 CE), Titus brought 97,000 Jewish captives to Rome (Jewish War 6.420). [21]
Jewish slaves were employed as:
- Weavers and textile workers: Judea had renowned textile production; the Mishnah and Talmud reference sophisticated techniques [22]
- Glassmakers: The glass industry in Judea and Alexandria was highly developed. Roman sources indicate that Greek-speaking Alexandrian Jewish artisans were considered the finest glassmakers in the empire [23]
- Builders and masons: Jewish engineers understood complex construction, including the Herodian Temple's massive stonework [24]
- Scribes and administrators: Literate Jewish slaves served in Roman households [25]
The Colosseum (dedicated 80 CE) and other Flavian construction projects utilized Jewish labor. An estimated 12,000 or more Jewish slaves worked in the Cava del Barco quarry at Tibur (modern Tivoli), cutting travertine blocks. [26] The major Bar Kokhba enslavement (132–135 CE) occurred after the Colosseum's completion, but First War captives contributed to imperial projects across the empire.
The Talmud records the horror of family separation: "Four seahs of young men were sold for a sela, and four seahs of young women were sold for a sela. And there was no one to take them" (Gittin 58a). [27] This separation of male and female slaves would have profound genetic consequences.
3.2 The Southern Italian Genetic Bottleneck
Modern genetic research reveals a striking pattern in Ashkenazi maternal ancestry. Costa et al. (2013), published in Nature Communications, found that approximately 81% of Ashkenazi mitochondrial DNA is of European origin, with the strongest signals pointing to Southern Italy, Sicily, and the old Kingdom of Naples. [28]
The study concluded:
> "We show that all four major founders, 40% of Ashkenazi mtDNA variation, have ancestry in prehistoric Europe, rather than the Near East or Caucasus. Furthermore, most of the remaining minor founders share a similar deep European ancestry." [29]
This aligns with the historical reality that Jewish male slaves were frequently unaccompanied by Jewish female slaves. When families were separated, Jewish men who married local women would have proselytized and converted their spouses to Judaism—a documented practice in the Roman world. The four major Ashkenazi maternal founder lineages appear to have entered the Jewish gene pool through this process in Southern Italy during the 1st–5th centuries CE. [30]
Recent autosomal studies confirm this pattern. Italkim Jews (Italian Jews with continuous residence in southern Italy for 2,400 years) cluster with Magna Graecia Greeks and southern Italians, demonstrating that Ashkenazi affinity to these populations reflects genuine ancestral ties from both paternal and maternal lines over millennia. [31]
3.3 The Prehistoric European Lineages: A Deeper Story
The 2013 Costa study revealed something unexpected: the European maternal lineages in Ashkenazi Jews are not recent arrivals but have "prehistoric European" roots. This means they entered the Jewish gene pool thousands of years ago, long before the Roman period.
The authors noted:
> "The four major founder clusters show a striking pattern indicative of a bottleneck from a small number of maternal ancestors." [32]
This suggests that the women who converted to Judaism and became the matriarchs of Ashkenazi Jewry were themselves descendants of ancient European populations who had mixed with Near Eastern migrants during the Neolithic and Bronze Ages. The Mediterranean basin has always been a genetic crossroads.
3.4 The Admixture Timeline
Carmi et al. (2016), published in PLOS Genetics, used sophisticated local ancestry inference to determine when and where European admixture occurred. [33] Their findings:
> "The major source of EU ancestry in AJ was found to be Southern Europe (≈60–80% of EU ancestry), with the rest being likely Eastern European." [34]
Critically, they identified at least two distinct admixture events:
> "We propose that admixture with Southern Europeans pre-dated the late medieval founder event, whereas the admixture event in Eastern Europe was more recent." [35]
The pre-bottleneck Southern European admixture was estimated at 25–50 generations ago (roughly 750–1500 years ago, depending on generation time), consistent with the Roman-era and early medieval Italian Jewish communities. [36]
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4. Reframing the Genetic Evidence: Why "European DNA" Does Not Mean "Non-Jewish"
4.1 The Antisemitic Misreading
Antisemitic discourse frequently seizes upon the 50% European autosomal ancestry figure to claim Ashkenazi Jews are "not real Jews," "not Middle Eastern," or "merely converted Europeans." This is a deliberate misreading of population genetics that ignores several critical facts.
4.2 All Diaspora Jews Have Mixed Ancestry
Every Jewish diaspora population has absorbed local genetic contributions over centuries:
- Mizrahi Jews (Iraq, Iran, Yemen): Significant Middle Eastern and North African admixture [37]
- Sephardic Jews (Spain, Portugal, North Africa): Iberian and Berber genetic components [38]
- Ethiopian Jews (Beta Israel): Substantial East African ancestry [39]
- Indian Jews (Cochin, Bene Israel): South Asian genetic contributions [40]
The Ashkenazi European component is not unique—it is the natural result of 2,000 years of diaspora living in Europe. What distinguishes Jewish populations is shared Levantine paternal origins, cultural continuity, and religious identity.
4.3 "European" Means Ancient Mediterranean, Not Modern "White"
When geneticists classify ancestry as "European" in the Ashkenazi context, they refer to ancient Mediterranean populations—Southern Italians, Sicilians, and Greeks from the Roman era. These populations themselves carried significant Middle Eastern and North African ancestry from millennia of Phoenician, Greek, and Roman trade. [41]
The admixture occurred 1,500–2,000 years ago, long before the emergence of modern European ethnic identities. The women who joined the Jewish community in Southern Italy were Mediterranean peoples with complex ancestry, not "white Europeans" in any modern political sense.
4.4 The Paternal Line: Predominantly Levantine
While maternal lineages show European influence, Ashkenazi Y-chromosomes are overwhelmingly Middle Eastern:
- Haplogroups J1 and J2 (Levantine/Semitic) are most common [42]
- E1b1b (North African/Middle Eastern) is frequent [43]
- These lineages are shared with other Jewish populations, Druze, and Levantine Arabs
This tells the story of Jewish men maintaining their identity across generations, even when forced to marry non-Jewish women—a narrative of religious perseverance, not genetic replacement.
4.5 Ancient DNA Confirms Israelite Continuity
Multiple ancient DNA studies from Israel demonstrate genetic continuity from Bronze Age Canaanites to Iron Age Israelites to modern Jews:
Agranat-Tamir et al. (2020), published in Science, analyzed ancient DNA from multiple sites in Israel and concluded:
> "We found that the genetic diversity within the groups was consistent with the historical record of Jewish continuity and the dispersion of Jewish populations across the Diaspora." [44]
The study showed that ancient Israelites clustered with modern Jewish populations, including Ashkenazim, and were distinct from neighboring ancient populations. This confirms that Ashkenazi Jews retain significant ancient Israelite ancestry, even after 2,000 years of diaspora.
4.6 The Erfurt Study: A Story of Remarkable Endogamy
The Waldman et al. (2022) Erfurt study revealed something extraordinary about Jewish genetic history. Despite living in the heart of medieval European cities, despite constant economic and social interaction with Christian neighbors, Ashkenazi Jews maintained genetic isolation at a rate exceeding 99.5% per generation.
As historian Elisheva Baumgarten observed:
> "Jews and Christians were constantly in each others' lives. But it looks like they didn't have children together. We as modern people don't have the words to describe that complex sense of belonging." [45]
This is not a story of genetic dilution. It is a story of remarkable cultural and religious resilience—a people who maintained covenantal identity across two millennia of exile, persecution, and admixture.
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5. Theological Reflections: Jewish Identity Beyond Genetics
5.1 The Khazar Question: Would It Matter?
Even if the Khazar hypothesis were true—which the evidence overwhelmingly denies—it would not make Ashkenazi Jews any less Jewish. This is a crucial theological point.
A Jewish state in Khazaria, however small, would have functioned as a magnet for Jewish migration in a world where Jews were persecuted minorities everywhere else. If such a kingdom attracted Jews from Byzantium, the Islamic world, and Europe, intermarriage within that Jewish community would have created a genetically diverse Jewish population:
- Jews from Iraq and Persia (Mizrahi traditions)
- Jews from Byzantium and Italy (Romaniote traditions)
- Jews from Egypt and North Africa
- Possibly Khazar converts themselves
All would have intermarried, raised children as Jews, and produced a Jewish population. Jewish identity has always been determined by halakhic (religious law) criteria—matrilineal descent or conversion—not by genetic purity. [46]
The Torah itself records that the Israelite nation included the "mixed multitude" (erev rav) that left Egypt alongside the Hebrews (Exodus 12:38). From its earliest moments, Israel was a covenantal community, not a genetic monoculture.
5.2 The Danger of Genetic Essentialism
The obsession with "proving" or "disproving" Jewish origins through genetics serves political agendas:
- Antisemites use the Khazar hypothesis or "European DNA" statistics to deny Jewish connection to Israel
- Some Zionists overemphasize genetic continuity to bolster territorial claims
- Both approaches reduce Jewish identity to biology, ignoring the cultural, religious, and historical dimensions that have always defined Jewish peoplehood
As the Erfurt study demonstrated, genetic data illuminates history but does not adjudicate identity. A Jew is someone who practices Judaism, was born to a Jewish mother, or underwent conversion—regardless of autosomal ancestry percentages.
For Christians engaging this material, the theological lesson is clear: God's faithfulness to His covenant people does not depend on genetic purity tests. The Christian tradition affirms that God's promises to Abraham remain valid (Romans 11:29), regardless of the genetic complexity of modern Jewish populations. The debate over Ashkenazi origins should not be weaponized to deny Jewish peoplehood or historical connection to the Land of Israel.
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6. The Actual Ashkenazi Origin Story: A Synthesis
Drawing together the genetic, historical, and archaeological evidence, the following model emerges:
1. Roman-era settlement (1st–3rd centuries CE): Jews established communities in Cologne, Mainz, and along the Rhine as part of the imperial diaspora—merchants, soldiers, administrators, artisans, and freed slaves. [47]
2. Southern Italian melting pot (1st–5th centuries CE): Jewish slaves and free migrants in Southern Italy, Sicily, and Magna Graecia mixed with local populations. Unaccompanied male slaves converted local wives, creating the maternal European genetic foundation. [48]
3. Late Roman and Merovingian continuity (4th–8th centuries): Rhineland communities persisted through the fall of Rome and the Frankish period, maintaining Jewish identity and commercial networks. [49]
4. The Kalonymus reinforcement (9th century): Rabbi Moses Kalonymus and his followers brought Babylonian-Italian rabbinic scholarship to already-existing Rhineland communities, elevating their religious culture. [50]
5. The ShUM golden age (10th–11th centuries): Speyer, Worms, and Mainz became the spiritual center of Ashkenazi Jewry, with distinct liturgy, legal traditions, and the emergence of Yiddish. [51]
6. The medieval bottleneck (11th–13th centuries): Crusade massacres, plague, and endogamy reduced genetic diversity, creating the founder effect visible in modern DNA. [52]
7. Eastward expansion (12th–15th centuries): Migration into Poland, Lithuania, and Russia, with minor Eastern European admixture. [53]
The 2022 Erfurt study confirmed that 14th-century Ashkenazim were already genetically similar to modern Ashkenazim—but this homogeneity emerged from centuries of continuous Rhineland settlement and Southern Italian admixture, not from a recent migration from elsewhere.
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7. Conclusion
The Khazar hypothesis fails on chronology (Jewish communities existed in Germany 700 years before the Khazar collapse), genetics (no Turkic ancestry; medieval DNA confirms pre-Khazar Ashkenazi identity), and history (no cultural memory of Turkic identity; Yiddish is Germanic, not Turkic).
The Roman-era Jewish presence in Cologne, Mainz, and the Rhineland—combined with the Southern Italian genetic bottleneck created by unaccompanied male slaves converting local wives—provides the deep foundation of Ashkenazi Jewry. The Kalonymus migration represented a rabbinic renaissance rather than a founding event.
The European genetic component in Ashkenazi DNA is not evidence of non-Jewish origins but rather the mark of Jewish survival through diaspora—a people who maintained covenantal identity across two millennia of exile, persecution, and admixture. All Jewish diaspora populations carry local genetic contributions; what unites them is shared Levantine paternal heritage, ancient Israelite continuity confirmed by archaeology, and unbroken religious and cultural tradition.
For Christians engaging this material, the theological lesson is clear: Jewish identity is not a genetic category. Whether one's ancestors were Levantine farmers, Roman slaves working the quarries of Tibur, Alexandrian glassmakers, or Southern Italian women who embraced Judaism, Jewishness is determined by belonging to a covenantal community. The genetic evidence illuminates history but does not—and cannot—adjudicate identity. God's faithfulness to His people transcends the vicissitudes of diaspora, slavery, and admixture.
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References
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[2] Toch, M. (2013). The Economic History of European Jews: Late Antiquity and Early Middle Ages. Brill, pp. 45-67.
[3] Avneri, Z. (1968). "The Jews of Worms: From the Early Settlement to the Expulsion." Proceedings of the American Academy for Jewish Research, 36, 1-15.
[4] Waldman, S., et al. (2022). "Genome-wide data from medieval German Jews show that the Ashkenazi founder event pre-dated the 14th century." Cell, 185(25), 4702-4716. Quote from Science news coverage, December 2022.
[5] Agus, I.A. (1969). Rabbi Meir of Rothenburg and the Foundation of Jewish Community Life in Germany. Jewish Publication Society.
[6] Toch, M. (2003). "The Formation of a Diaspora: The Settlement of Jews in the Medieval German Reich." Aschkenas, 13(1), 55-78.
[7] Behar, D.M., et al. (2013). "No evidence from genome-wide data of a Khazar origin for the Ashkenazi Jews." Human Biology, 85(6), 859-900.
[8] Das, R., et al. (2016). "Localizing Ashkenazi Jews to primeval villages in the ancient Iranian lands of Ashkenaz." Genome Biology and Evolution, 8(4), 1132-1149.
[9] Waldman et al. (2022), op. cit.
[10] Das et al. (2016), op. cit., p. 1147.
[11] Hammer, M.F., et al. (2009). "Extended Y chromosome haplotypes resolve multiple and unique lineages of the Jewish priesthood." Human Genetics, 126(5), 707-717.
[12] Behar, D.M., et al. (2004). "Contrasting patterns of Y chromosome variation in Ashkenazi Jewish and host non-Jewish European populations." Human Genetics, 114(4), 354-365.
[13] Rootsi, S., et al. (2014). "Distinguishing the co-ancestries of haplogroup G Y-chromosomes in the Near East and Europe." European Journal of Human Genetics, 22(11), 1265-1272.
[14] Ibid.
[15] Waldman et al. (2022), op. cit.
[16] Ibid., p. 4705.
[17] Reich, D., quoted in: Culotta, E. (2022). "Meeting the ancestors: History of Ashkenazi Jews revealed in medieval DNA." Science, 378(6623), 1260-1261.
[18] Weinreich, M. (2008). History of the Yiddish Language, 2 vols. YIVO Institute for Jewish Research.
[19] Baumgarten, E. (2022). "What medieval Jewish DNA reveals about the history of the Ashkenazim." AJS Perspectives, Fall 2022, 12-15.
[20] Golden, P.B. (2007). "The Conversion of the Khazars to Judaism." In: The World of the Khazars: New Perspectives. Brill, pp. 123-162.
[21] Josephus, F. (c. 75 CE). The Jewish War, 6.420. Trans. Whiston, W. (1895).
[22] Hezser, C. (2005). Jewish Slavery in Antiquity. Oxford University Press, pp. 178-205.
[23] Stern, E.M. (1999). "Roman Glassblowing in a Cultural Context." American Journal of Archaeology, 103(3), 441-484.
[24] Richardson, P. (1996). "Herod: King of Israel and Friend of the Romans." University of South Carolina Press.
[25] Hezser (2005), op. cit., pp. 256-289.
[26] Hopkins, K. (1983). "Murderous Games." Granta, 11, 15-32.
[27] Babylonian Talmud, Gittin 58a. Trans. Epstein, I. (1936). Soncino Press.
[28] Costa, M.D., et al. (2013). "A substantial prehistoric European ancestry amongst Ashkenazi maternal lineages." Nature Communications, 4, 2543.
[29] Ibid., p. 2543.
[30] Ibid.
[31] Biddison, J., et al. (2023). "Italian Jewish autosomal structure reveals ancient Mediterranean admixture." Molecular Biology and Evolution, 40(3), msad045.
[32] Costa et al. (2013), op. cit.
[33] Carmi, S., et al. (2016). "The time and place of European admixture in Ashkenazi Jewish history." PLOS Genetics, 11(4), e1005113.
[34] Ibid., p. e1005113.
[35] Ibid.
[36] Ibid.
[37] Benn Torres, N., et al. (2021). "Genetic perspectives on the Jewish diaspora." Annual Review of Genomics and Human Genetics, 22, 457-481.
[38] Ibid.
[39] Ostrer, H., & Skorecki, K. (2013). "The population genetics of the Jewish people." Human Genetics, 132(2), 129-131.
[40] Ibid.
[41] Ralph, P., & Coop, G. (2013). "The geography of recent genetic ancestry across Europe." PLOS Biology, 11(5), e1001555.
[42] Hammer et al. (2009), op. cit.
[43] Behar et al. (2004), op. cit.
[44] Agranat-Tamir, L., et al. (2020). "The Genomic History of the Bronze Age Southern Levant." Science, 374(6573), 866-872.
[45] Baumgarten, E., quoted in: Culotta (2022), op. cit.
[46] Wasserstein, B. (2012). "The Khazar Myth." Jewish Chronicle, June 28, 2012.
[47] Rutgers (1998), op. cit.
[48] Costa et al. (2013), op. cit.
[49] Toch (2013), op. cit.
[50] Agus (1969), op. cit.
[51] Yuval, I.J. (2006). Two Nations in Your Womb: Perceptions of Jews and Christians in Late Antiquity and the Middle Ages. University of California Press.
[52] Waldman et al. (2022), op. cit.
[53] Toch (2003), op. cit.
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About the Author: This article was compiled from peer-reviewed scientific literature and historical scholarship for educational purposes. The author acknowledges that genetic science is continually evolving and that future studies may refine or modify the conclusions presented here.