Hi folks,
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I've finally found a quiet weekend in which to update my phylogeography document to include R-DF98:
This is my own haplogroup, so I'm very pleased to get it done, as it is the most significant update in understanding I've managed to make in almost a decade.
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When we first discovered the Kings' Cluster back in the early 2010s, I posited its origin to be in the middle Rhine valley during the Celtic era. Better TMRCAs from BigY testing and ancient DNA from Prague then suggested an origin in Bohemia during the Unetice Culture. With this update, that Unetice Culture origin doesn't change, but I can't find a migration pattern that agrees with an origin in Bohemia: even correcting for our horrendous testing bias, we clearly have a source and distribution for R-DF98 that is to the west of Bohemia. So I've speculated and put the obligatory pin in the map somewhere in central Germany, somewhere in the west of the Unetice Culture's distribution. That isn't a precise position, but I've had to choose somewhere to make a map!
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From there, we see a lot of migration into the middle Rhine valley. This means that there aren't the same post-Roman migration patterns in R-DF98 that we see in the R-U106 haplogroups I've covered previously. While we have our ancient DNA samples from Driffield Terrace showing that some R-DF98 branches made it to the British Isles during the Roman period, most(!) of the migration out of Germany, France and the Rhine Valley between them seems to happen at a later stage. In the British Isles in particular, a lot of it appears Norman in origin.
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You can see from the above the scale of the potential changes to this model that can yet happen as we dig into R-DF98's history in the future. However, for now I'm comfortable that this is a significant step in our understanding of this haplogroup.
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Best wishes,
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Iain.