If you are referring to the Jewish Diaspora, then it was the Jews that experienced it.

The romans carried on the Jewish diaspora, begun by the Assyrians and Chaldeans.

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The Jewish diaspora occured Babylonia, Eastern Europe, Israel, Poland, Spain, Greece, and Italy

"Diaspora" is not capitalized when used in a general sense to refer to any dispersed population of people, such as the Jewish diaspora or the African diaspora. It is typically capitalized when used as part of a specific name or title, such as the Diaspora community or the Diaspora Studies department.