These kingdoms were later incorporated into various Iranian empires, including Achaemenid Empire and Sassanid Empire.
In 1795 the ruler of Iran, Agha Mohammad Khan Qajar, attacked the region to bring it again within the Iranian empire.
In fact, in the words of Elton L. Daniel, the Elamites were "the founders of the first 'Iranian' empire in the geographic sense."
By the end of the eighteenth century, both the Ottoman and Iranian empires were in disarray.
Persian penetration into this region at a very early date is connected with the need to defend the northern frontier of the Iranian empire.
In Middle Persian sources, the name "Iran" is used for the pre-Sassanid Iranian empires as well as the Sassanid empire.
Tajikistan, due to historical and cultural ties with Iran and the former Iranian empires, is regarded as a part of Greater Iran.
It is supposed that during the attack of Alexander this city was part of Iranian empire.
Hence one contemporary historian, Elton Daniel, states that the Elamites are "the founders of the first Iranian empire in the geographic sense".
Built some 2,500 years ago, Persepolis was the royal seat of an Iranian empire that, at its height, stretched from the Indus Valley to the Mediterranean Sea.