I suspect that this 35% Balkan 23andme gave me comes from both the ancient settlement of both the Greeks and Illyrians (Messapian). I think it makes sense given the history of Puglia. At least for the most part. Though, I don't rule out more recent migrations in addition to the ancient migrations. Nevertheless, I find it interesting that
Geneplaza gives me 0% Yamnaya, within my steppe ancestry, if that could provide any clues. Though I'm 16.8% of the other two Steppe components, and 6.2% WHG/SHG. If it was more recent wouldn't there at least be some Yamnaya from Slavic admixture brought later to the Balkans?