It spread from Persia through the Middle East, Egypt and Central Asia.
The Assyrian, Babylonian and Hellenic.
It was a courier system, by roads and by sea for official use.
Control over Mesopotamia and Assyria, then over Asia Minor.
The Persian Empire.
The Persian Empire was not a person.
Persian Empire
The Persian Empire absorbed the Babylonian Empire.
Alexander the Great defeated the Persian empire
The Persian Empire absorbed the Baabylonian Empire.
The Persian Empire incorporated the Indus Valley.
Alexander conquered the Persian Empire.
An empire is an empire, a war is a war.