The version I heard (believe it was on History Channel), was that it came from Central Kazakhstan, moved Westward through Russia (no record of the deaths in this part of the World), and moved onward to Turkey.
During a battle between the Turks and Venetians, the Turks began flinging the bodies of dead Turks over the walls of the Venetian fort.
Venetians returning to Italy brought the Plague back with them.
That's the story I heard. I'll have to "Google" the subject...
That is the story. Of course, Columbus discovered America and there was nothing before, as taught (by whom?). Neither Greenland nor Vinland existed, nor the Grand Bank fishing waters. There were neither Turkeys nor turkey corn in England. Ignore the Vikings, the English, the Portugese, the Chinese, the Turks, and the Irish. Ignore the tobacco leaves used to line the insides of Egyptian mummies 2000 BC and the cocaine in their hair. Google away, don’t forget Wikipedia.