In 550 BC, the ancient Persians established the first empire across Europe, Asia and Africa in human history, which was later called Achemani Dynasty and ruled for a period of time. In 330 BC, the government of Alexander the Great conquered the ancient Persian Empire and extended the border of Macedonian Empire to the northwest corner of India. In a sense, under the rule of Alexander, the ancient Persian Empire has ceased to exist, leaving only the local residents in their hometown. In 323 BC, Alexander died, and the Macedonian empire quickly disintegrated into several Hellenistic countries, which were divided for a long time and were loosely ruled by the Seleucid dynasty, the strongest Hellenistic country at that time.
In 247 BC, the Parthians in the northeast of the Iranian plateau overthrew the rule and established a rest empire. This branch is still close to the origin of ancient Persia. Then in 226 AD, the local small dynasty ruled by these powerful dynasties for a long time, its warlord Ardashir I rose up, overthrew the rest dynasty, won the rest capital cte sink, and established a new dynasty-Sassanian Dynasty.
This dynasty de-Hellenized, from the very beginning, tried to draw a clear blood relationship with the ancient Persian nobles, and claimed that its ancestor was Darius Iii, the last king of the Achaemenid dynasty in ancient Persia. Although this part of historical facts remains to be verified, the founders of Sassanian dynasty and their ancestors have long settled in the birthplace of ancient Persia. He never left until the end of the empire. From this point of view, it can be said that some afterglow of the ancient Persian empire is still preserved. Actually, it's far away.