Quotes from book
The Thirteenth Tribe

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.