Ashkenazi Jews: Their Fathers Came from Israel. But Their Mothers?

Almost half of all Ashkenazi Jews in the world — around eight million people — descend from just four women. Not a tribe, not a community, not a city. Four specific women who lived roughly two thousand years ago. Their mitochondrial DNA still lives in every second Jewish family from Brooklyn to Tel Aviv. Who were they? What language did they speak? And most importantly — where did they come from? One renowned researcher said: Europe. Another, equally renowned, said: no, the Levant. On the same data, in the same laboratories. Twenty years later, the argument hasn't died down — it has only flared up stronger.
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Material based on scientific articles from pmc.ncbi.nlm.nih.gov:

Maternal lineages — Ashkenazi mtDNA
Four founding mothers, ~40% of all mtDNA variation, haplogroups K and N1b: PMC1380291
Prehistoric European ancestry of the four major lineages, ~80% pan-European genealogy: PMC3806353

Paternal lineages — Y-chromosome
Shared Middle Eastern pool between Diaspora Jews and non-Jewish Levantines, estimated admixture with Europeans 5–8% (≈0.5% per generation): PMC18733

Ancient DNA — medieval Erfurt Ashkenazi (14th century)
33 genomes from the Erfurt Jewish cemetery; the Ashkenazi founder event pre-dated the 14th century; greater Eastern European variability in medieval than in modern individuals: PMC9793425

Modern reassessment of the picture (2025)
Livni J., Skorecki K. "Distinguishing between founder and host population mtDNA lineages in the Ashkenazi population." Human Gene, vol. 45, 201445 (September 2025). DOI: 10.1016/j.humgen.2025.201445 — not indexed in PMC, accessible via ScienceDirect