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Yes. it was part of Iran in past. but today is not in Iran. Iran borders changed during history for war and so on.
Iran was called Persia at that point in history; it was ruled by the Sassanid Empire.
Iran was not discovered.
It has a history of 7500 years. Most people don't know that "Iran" and "Persia" are the same
Harold Bailey has written:
'The Cambridge History of Iran Complete set of 8 volumes (The Cambridge History of Iran)'
Both Iran and Israel have a history of hostility with various Arab nations.