well. u seem to know a lot of things about the past in countries you've never visited.
Many people/living-souls came on this earth, and later disapeard. For instance, lions existed once upon a time in Europe. and so did the T-Rex . But now they don't.
And same goes with the black people you are suggesting that lived in the land now called Iran, before the original Iranians (non-black people) settled there.
But 2day, Pianke Nubiyang, Iranians are not black. The history of those 5 000 (Iran, total: 70 million people) darker (african looking) individuals living in the South of Iran trace their history as slaves from East Africa during the 17th century. These people are not the original Iranians. But they are now officially Iranians, since Persia turned to Iran, and tried (ironicly) to erase all ethnic differences. Almost like in The US where Africans who once came by force as slaves, are now Americans.
There u go.
But I can tell (from your other messages) that you don't know much about Iranians (people, culture, language, geography heritage, and history). U've probably never even met an Iranian.

By the way, could you tell a bit about the Minoans that lived in Crete. Were they black too?