The empire established by the Persians, incorporating the previous Assyrian and Babylonian Empires and extending west to Libya-Egypt and east to Central Asia and today's Pakistan.
Very large - multi-continental.
King of Kings.
The Persian Empire.
The Persian Empire was not a person.
The term used by the Persians was Satrapy, the governor was a Satrap. These are Anglicised words from the Persian language original.
It allowed it to convert the Delian League which it led against the Persian Empire into an empire of its own and live high on the hog on the proceeds.
Persian Empire
The Persian Empire absorbed the Babylonian Empire.
Alexander the Great defeated the Persian empire
The Persian Empire absorbed the Baabylonian Empire.
The term Persian Empire is loosely used to cover several periods. The real empire of the Persians was 550-321 BCE. Other peoples took over Persia, starting with Alexander the Great.
Alexander conquered the Persian Empire.