Cultures > Achaemenid Empire
Through a long campaign and series of brutal conflicts Alexander III the Great was able to subdue the Achaemenid Empire under the reign of Darius III and bring it under his control.
See Seleucid Empire
In the conflicts that became known as the Wars of the Diadochi some of the Persian Empire territories were eventually ruled by the Seleucid Empire. Some parts were lost to foreign civilizations such as the Maurya Empire but the core was held together for several centuries by this empire.
See Parthian Empire
The Seleucid Empire would later be conquered from two fronts by the Roman Empire and the Parthia Empire, the latter of which would assume most of the territories of the previous Media/Persian Empires.