It was of one variety, 391 = 11. In this spread it reached,
among others, the proto-slavs who according to many sources had their earliest homeland in the
Pripet marshes area which I believe are on the
Poland/Ukraine/Byelarus border area. Among the proto-slavs a new variety with 391 = 10 was founded and thrived and became competitive with the original 391 = 11 in population. Only in the 5th and 6th century A.D. or so did the Slavs really start to expand in eastern Europe to populate the many places we find them today; westward as far as present-day
Eastern Germany, eastward into Russia, and southwestward into the Balkans, Czechoslovakia, etc.
...
The areas of greatest percentage of 391 = 10 variety will be close to the home area up in Poland/Ukraine/Byelarus where it was born.
Down in the Balkans it would seem that where a lot of R1a was brought in by the slavs, I should expect more percentage of the 391 = 10 I1b brought in by the slavs according to this hypothesis.
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