https://en.wikipedia.org/wiki/Barbary_slave_trade#cite_note-auto-11
“Sixteenth- and 17th-century customs statistics suggest that Istanbul’s additional slave import from the Black Sea may have totaled around 2.5 million from 1450 to 1700.”
I missed that little tidbit in history class.
Yeah buyt it did say “Black Sea” so obviously they were Africans right? ;-)