<Table> <Tr> <Td> </Td> <Td> This article is incomplete . Please help to improve it, or discuss the issue on the talk page . (March 2017) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article is incomplete . Please help to improve it, or discuss the issue on the talk page . (March 2017) </Td> </Tr> <P> The Persian Empire (Persian: شاهنشاهی ایران ‎, translit . Šâhanšâhiye Irân, lit .' Imperial Iran') refers to any of a series of imperial dynasties that were centred in Persia / Iran from the 6th - century - BC Achaemenid Empire era to the 20th century AD in the Qajar dynasty era . </P> <P> The first dynasty of the Persian Empire was created by Achaemenids, established by Cyrus the Great in 550 BC with the conquest of Median, Lydian and Babylonian empires . It covered much of the Ancient world when it was conquered by Alexander the Great . Persepolis is the most famous historical site related to Persian Empire in the Achaemenid era and it has been a UNESCO World Heritage Site since 1979 . </P>

What is another name for the persian empire