The Khazars were a nomadic Turkic people that in the late 6th-century CE established a major commercial empire covering the southeastern section of modern European Russia, southern Ukraine, Crimea, and Kazakhstan. They created what for its duration was the most powerful polity to emerge from the break-up of the Western Turkic Khaganate. Astride a major artery of commerce between Eastern Europe and Southwestern Asia, Khazaria became one of the foremost trading empires of the early medieval world, commanding the western marches of the Silk Road and playing a key commercial role as a crossroad between China, the Middle East and Kievan Rus'. For some three centuries the Khazars dominated the vast area extending from the Volga-Don steppes to the eastern Crimea and the northern Caucasus.
Ashkenazi Jews, also known as Ashkenazic Jews or Ashkenazim, are a Jewish diaspora population who formed in the Holy Roman Empire around the end of the first millennium CE. Their traditional diaspora language is Yiddish, which developed during the Middle Ages after they had moved from Germany and France into Northern Europe and Eastern Europe. For centuries, Ashkenazim in Europe used Hebrew only as a literary and sacred language until the revival of Hebrew as a common language in 20th-century Israel. Throughout their numerous centuries living in Europe, Ashkenazim have made many important contributions to its philosophy, scholarship, literature, art, music, and science.
Y-chromosomal Aaron is the name given to the hypothesized most recent common ancestor of the patrilineal Jewish priestly caste known as Kohanim. According to the traditional understanding of the Hebrew Bible, this ancestor was Aaron, the brother of Moses.
Jewish ethnic divisions refer to many distinctive communities within the world's ethnically Jewish population. Although considered a self-identifying ethnicity, there are distinct ethnic subdivisions among Jews, most of which are primarily the result of geographic branching from an originating Israelite population, mixing with local communities, and subsequent independent evolutions.
The Thirteenth Tribe is a 1976 book by Arthur Koestler, in which the author advances the thesis that Ashkenazi Jews are not descended from the historical Israelites of antiquity, but from Khazars, a Turkic people. Koestler hypothesized that the Khazars migrated westwards into Eastern Europe in the 12th and 13th centuries when the Khazar Empire was collapsing.
Medical genetics is the branch of medicine that involves the diagnosis and management of hereditary disorders. Medical genetics differs from human genetics in that human genetics is a field of scientific research that may or may not apply to medicine, while medical genetics refers to the application of genetics to medical care. For example, research on the causes and inheritance of genetic disorders would be considered within both human genetics and medical genetics, while the diagnosis, management, and counselling people with genetic disorders would be considered part of medical genetics.
David Emil Reich is an American geneticist known for his research into the population genetics of ancient humans, including their migrations and the mixing of populations, discovered by analysis of genome-wide patterns of mutations. He is professor in the department of genetics at the Harvard Medical School, and an associate of the Broad Institute. Reich was highlighted as one of Nature's 10 for his contributions to science in 2015. He received the Dan David Prize in 2017, the NAS Award in Molecular Biology, the Wiley Prize, and the Darwin–Wallace Medal in 2019. In 2021 he was awarded the Massry Prize.
The genetic history of the Middle East is the subject of research within the fields of human population genomics, archaeogenetics and Middle Eastern studies. Researchers use Y-DNA, mtDNA, and other autosomal DNAs to identify the genetic history of ancient and modern populations of Egypt, Persia, Mesopotamia, Anatolia, Arabia, the Levant, and other areas.
Jon Entine is an American science journalist. After working as a network news writer and producer for NBC News and ABC News, Entine moved into print journalism. Entine has written seven books and is a contributing columnist to newspapers and magazines. He is the founder and executive director of the science advocacy group the Genetic Literacy Project, and a former visiting scholar at the American Enterprise Institute. He is also the founder of the consulting company ESG Mediametrics.
Shlomo Sand is an Israeli Emeritus Professor of History at Tel Aviv University.
The medical genetics of Jews have been studied to identify and prevent some rare genetic diseases that, while still rare, are more common than average among people of Jewish descent. There are several autosomal recessive genetic disorders that are more common than average in ethnically Jewish populations, particularly Ashkenazi Jews, because of relatively recent population bottlenecks and because of consanguineous marriage. These two phenomena reduce genetic diversity and raise the chance that two parents will carry a mutation in the same gene and pass on both mutations to a child.
Genetic studies on Jews are part of the population genetics discipline and are used to analyze the chronology of Jewish migration accompanied by research in other fields, such as history, linguistics, archaeology, and paleontology. These studies investigate the origins of various Jewish ethnic divisions. In particular, they examine whether there is a common genetic heritage among them. The medical genetics of Jews are studied for population-specific diseases.
Genetic history of the Arab world refers to the analyses of the genetics of ethnic Arab populations within the Middle East and North Africa. The Arab world has one of the highest rates of genetic disorders globally; some 906 pathologies are endemic to the Arab states, including thalassaemia, Tourette's syndrome, Wilson's disease, Charcot-Marie-Tooth disease, mitochondrial encephalomyopathies, and Niemann-Pick disease.
The Invention of the Jewish People is a study of Jewish historiography by Shlomo Sand, Professor of History at Tel Aviv University. It has generated a heated controversy. The book was on the best-seller list in Israel for nineteen weeks.
Stylianos E. Antonarakis is a Greece-born human geneticist.
The Khazar hypothesis of Ashkenazi ancestry, often called the Khazar myth by its critics, is a largely abandoned historical hypothesis that postulated that Ashkenazi Jews were primarily, or to a large extent, descended from Khazars, a multi-ethnic conglomerate of mostly Turkic peoples who formed a semi-nomadic khanate in and around the northern and central Caucasus and the Pontic–Caspian steppe. The hypothesis also postulated that after collapse of the Khazar empire, the Khazars fled to Eastern Europe and made up a large part of the Jews there. The hypothesis draws on medieval sources such as the Khazar Correspondence, according to which at some point in the 8th–9th centuries, a small number of Khazars were said by Judah Halevi and Abraham ibn Daud to have converted to Rabbinic Judaism. The scope of the conversion within the Khazar Khanate remains uncertain, but the evidence used to tie the subsequent Ashkenazi communities to the Khazars is meager and subject to conflicting interpretations.
Paul Wexler is an American-born Israeli linguist, and Professor Emeritus of linguistics at Tel Aviv University. His research fields include historical linguistics, bilingualism, Slavic linguistics, creole linguistics, Romani and Jewish languages.
Eran Elhaik is an Israeli-American geneticist and bioinformatician, and an associate professor of bioinformatics at Lund University in Sweden. His research uses computational, statistical, epidemiological and mathematical approaches to fields such as complex disorders, population genetics, personalised medicine, molecular evolution, genomics, paleogenomics and epigenetics.
Robert Williamson is a retired British-Australian molecular biologist who specialised in the mapping, gene identification, and diagnosis of human genetic disorders.
In the late 19th century, amid attempts to apply science to notions of race, some advocates of Zionism sought to reformulate conceptions of Jewishness in terms of racial identity and the "race science" of the time. They believed that this concept would allow them to build a new framework for collective Jewish identity, and thought that biology might provide "proof" for the "ethnonational myth of common descent" from the biblical land of Israel. Countering antisemitic claims that Jews were both aliens and a racially inferior people who needed to be segregated or expelled, these Zionists drew on and appropriated elements from various race theories, to argue that only a Jewish national home could enable the physical regeneration of the Jewish people and a renaissance of pride in their ancient cultural traditions.
