There's about what, 23 or 24 samples? Four or five seem to drift off toward Cyprus, and the rest plot right with Southern Italians/Sicilians.
Why do we have some that drift that way? I don't know.
Where would Dodecanese people plot, for example? Or Minoan like people? Where precisely would the Mycenaeans plot? Also, parts of Italy were settled by Greek colonists who had first settled coastal Anatolia.
Are you thinking most of them might have actually been like that and were pulled north subsequently? In Sicily I would say definitely, given the Lombard migrations. Perhaps Campania too, which got some "more northern" influence. It was long believed the Celt-Ligurians were re-settled in Samnite areas. I don't think that's true for Calabria, however, and northern parts of Apulia got more "southern" input from "Moorish" troops re-settled there after the end of that era. Supposedly they were all eventually killed or sold into slavery, however.
The issue of slavery is a tricky one. I've hunted for years for some sort of contemporary evidence as to whether slaves from certain campaigns went to one part of the empire versus another, or one part of Italy versus another, and have never found a single thing. In the south, in particular, there were many vast latifundia or agricultural estates, but why would Germanic or Gallic slaves be sent there in preference to slaves from Greece or Anatolia or the Levant? Slaves went where they were needed. Plus, you didn't last long on latifundia, or mines, or on the galleys. The slaves who would be more likely to attract the notice of owners and perhaps freed after long service would be house slaves or slaves who had more skills. The Greek slaves were always the most prized, and if anything would have made them more "southern", and would have produced little change at all.
Plus, we have to be careful of the time periods here, don't you think?
Were those more "southern" "Romans" during the Republican Era very much like the "southern like" Romans of the Imperial Era? What are the exact dates for all of the samples? From that we would know what groups were or were not enslaved by that time and could have had an impact. In much of the Republican Era it would be from other people of the Italian peninsula.
However, let's be clear. Slave graves are quite different from the graves of reasonably well off Roman citizens. As are the graves around brothels where women didn't last too long, and graveyards full of aborted fetuses and newborns have been found, or in the merchant quarters right next to the docks. There's little likelihood such people would have had a great impact on genetics. Goodness, we have a big bunch North Africans in medieval London too. If they've done some isotope analysis that would help us wade through some of this.
Is that information that they came from north of Rome another leak? How far north of Rome? It doesn't matter if it's not in the city of Rome itself. Anything in "Latin" territory would do. There was a small area north of Rome which was still in the lands of the "Latini", but if you really go north you're in the lands of the Etruscans, Sabines, and Umbrians and Picene, which the leaks also said were similar to one another and more "northern", so that wouldn't be consistent.
https://delong.typepad.com/.a/6a00e5...2739970b-600wi
If the Sabines, like the Etruscans, are more "northern" like, then things like the "Rape", really "Kidnapping" of the Sabine women would just make them more northern.
The locations as well as the dates and the burial contexts are all really important here, and I hope they did isotope analysis. If the Republic Era samples are not here because this isn't the Moots paper then that leaves a lot of holes.