In 14 53, constantinople's modern day istanbol writes old roman city that becomes a later roman city you would call bzantine city. And then in 14 53, get's taken finally by the turks. And if you look at istambee to day, you can see how it basically controls access to the black sea. It's the nozzle on the wine skin bag. The black sea is a major, major slave transport zone. When constantinople falls, the ottoman turks cut off,. they divert the slaves that were coming up from that area to the major slave markets in the mediterranean and places like that. But when they do