A king and his council, Persian provincial governors and local government.
The provincial Governors called Satraps, and his central councillors.
They helped keep the large empire united.
The Byzantine and Persian empires were weak.
Macedonian.
Sea and road couriers.
The Persian Empire.
The Persian Empire was not a person.
Persian Empire
The Persian Empire absorbed the Babylonian Empire.
His persistence in running a 10 year military campaign to take over all the Persian Empire.
Alexander the Great defeated the Persian empire
He created alliances with many greek city-states