All three of these Jewish groups began in the Middle East, according to the map provided. You can see that they originate from areas near Egypt and Arabia. But over time, the Jews spread to different parts of the world such as the Roman Jews going to Italy whilst the Exile going to Mesopotamia and Egypt.
Unfortunately, I can't answer that last question as I don't know much information about the Torah or what role it played during that time period. I hope this helps you someway regardless! Good luck! :)
Knights of Saint John of Jerusalem
Rome's location on the Italian peninsula, and the Tiber River, provided access to trade routes on the Mediterranean Sea. As a result, trade was an important part of life in ancient Rome. ... Later, the Roman armies used these same routes to conquer large amounts of territory and expand the empire along the Mediterranean.
I hope this helps!
Nikolai Novikov was the Soviet Ambassador to the United States in 1946-1947 and he prepared his telegram for Stalin and Molotov.