<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') is a series of imperial dynasties centered in Persia / Iran since the 6th century BC in the Achaemenid era, to the 20th century AD in the Qajar 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> <P> From 247 BC to 224 AD, Persia was ruled by the Parthian Empire, which supplanted the Hellenistic Seleucid Empire, and then by the Sassanian Empire, which ruled up until the mid-7th century . </P>

In 550 bc which leader began the persian empire