The year is unknown. It dates from the second half of the 6th Century BCE.
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it began with the amalgamation of Persia and Media. The usual date accepted in 550 BCE under King Cyrus the Great.
There is not just one Persian Empire. There are several. If you are specifically referring to the Persian Empire of Cyrus the Great, Darius, and Xerxes, that empire was overrun by Alexander the Great between 334-324 B.C.E.
550 B.C. for PCH
In the year of 291384914
Alexander the Great invaded and conquered the Persian Empire in the year 334BC