Roman Empire:\tRoman empire extended from Spain to Syria along the Mediterranean.\tIt had more of a diverse population in looking into its geographical expanse . It was characterised by many cultures but had common government with single ruler/emperor.\tGreek and latin languages were used for adminstrative purposes.Iranian empire:\xa0\tIt controlled major part of the Caspian sea, large parts of Afghanistan and eastern Arabia.\tThe Parthians and Sasanians dynasties,ruled over the people of Iran. It was not as diverse as the Roman empire.\tPeople spoke Persain language.