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Tried running both South Italians and Ashkenazi Jews on nMonte. The South Italians are a proxy for Romans. The South Italian gets 94% South Italian. Don't know why it doesn't get 100% but 94% is close enough. The Jew gets a decent chunk of Samaritan as well as some German. They seem to have little to no North Italian, unlike the popularly believed narrative that they're half-North Italian (and half-Levantine).
But anyways, they're not converted Romans, just superficially very similar on an autosomal level (though they do have a lot of Roman/Italian blood).
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