When did the Persian Empire fall?

Question: When did the Persian Empire fall!?
Best Answer - Chosen by Asker:

Hi
Which one you mean !?
there were many Persian empires
as examples :
1- Sassanid empire fall when Arabs invade it and enter Islam to it in 651 A!. D!.
2- modern one ( I mean that of Shah ) : in 1979 when the Islamic revolution in Iran occurred
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