Cyrus and Darius the Great both ruled over the Persian Empire
Two centuries.
Susa and Persepolis.
Darius the Great and Xerses the Great
here are the two empires at their height: Persian: http://www.cais-soas.com/CAIS/Images2/Maps/Achaemenid_Empire_Map.bmp Roman: http://www.dkimages.com/discover/previews796379533.JPG The Persian Empire is greatest in area. Whether it was bigger depends on what criteria you want to measure the two against - population, wealth etc.
Cyrus and Darius the Great both ruled over the Persian Empire
mexico
Two centuries.
The Persian Empire and an alliance of Greek city-states.
The outcome of the Persian Wars left a continuing fighting between Greek cities which so weakened them that the way was opened for Macedon to become dominant. This dominance and resulting military power allowed Alexander the Great to take over the Persian Empire spread of Greek culture and religion
Susa and Persepolis.
Cyrus and Darius the Great both ruled over the Persian Empire
Persia's conquest and absorption of the Babylonian Empire. Persia's takeover of the Lydian Empire.
Darius the Great and Xerses the Great
Cyrus the Great and Darius the Great.
Relative peace and prosperity for its inhabitants for two centuries.
The Persian Empire was taken over by Alexander the Great nearly two thousand years earlier if you are talking about 1500 CE. If you meant 1500 BCE, the Persian Empire came into existence a thousand years later.