Quote Originally Posted by Cyrus View Post
R1a1a1b has a very low frequency in Iran but R1b1a1a2a in the northwest to the southwest of Iran where Cimmerians (Persians) lived, has a high frequency. Sarmatians were an eastern Iranian people, they originally lived in the Central Asia. As said in another thread, Cimmerians (Persians) were originally a Thracian or Illyrian people who adopted an Iranian language, we see very different sound changes in eastern and western Iranian languages, for example Persian bištan and Avestan duuaēθā have the same Iranian origin: https://en.m.wiktionary.org/wiki/Rec...European/dwey-
Yes, specifically R1b-CTS7822 looks to have been present in the same Eastern Baltic area and culture (Eastern Corded Ware) as R1a1a1b, and both almost certainly mixed into the same core population.

It looks likely that Ossetians inherited their Iranian language from people with a branch of East European CTS7822 (Y5587) as one of their dominant paternal haplogroups.

This mixed Eastern Baltic population looks to have been the common component of Iranian-speaking peoples from Ossetia to Iran to Tajikstan, and installed its own language in a number of places despite only contributing about 10% of autosomal DNA to each. To me, they look most likely to be a domineering, colonising minority who were eventually absorbed by their host populations.