Speaking of the pitfalls of popular reporting on historical research, a Spanish documentary received much attention in October because of its claim that new genetic evidence implied that Christoper Columbus was of Jewish ancestry. Mosaic noted reasons for skepticism on historical grounds. Razib Khan, a geneticist, points out the flimsy biological reasoning behind the claim:
Though [the documentary] showed that Columbus’s paternal and maternal lineage were compatible with Sephardi Jewish ancestry, it didn’t establish that he had clear Sephardi Jewish ancestry. . . . When it comes to famous figures, however, media outlets often elide this complexity,
It is true that [Columbus’s] paternal lineage, J2, is very common among Sephardi Jews. But J2 is distributed from eastern China to Spain. In Spain, its frequency is 10 percent in the overall male population and 25 percent in Sephardi Jews. In northern Italy—home to Columbus’s notional birthplace, Genoa—J2 is also 25 percent in frequency. A simple inspection of the frequencies of the J2 haplogroup should raise doubts about the Columbus documentary’s claims.
Though it is still possible that Columbus’s recent ancestors were Jews, it seems more likely that they shared the same deep ancestors, with both northern Italians and Sephardi Jews being the products of the world after the collapse of Rome.