I seem to remember reading somewhere of a city discovered in Siberia ( or thereabouts ) that dated from the time of Zoroaster..
This was back when Russia was still the USSR, IIRC..
I wonder what sort of heritage / history is available on the northern siberian "tribes".. ?
From what I understand, they are in some ways, culturally like the Finnish tribes, reindeer breeders and herders, and still use the migratory housing, habits, traditions..
It would be interesting to know what their language history and genetic history is..