Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Seleucid Parthian wars were a series of conflicts between the Seleucid Empire and Parthia which resulted in the ultimate expulsion of the Seleucids from Persia and the establishment of the Parthian Empire. The wars were caused by Iranian tribes migrating into Central Asia and the inability of the Seleucids to properly defend or hold together their vast empire.In 323 BCE, the Seleucid Empire was founded by Seleucus I, a general of Alexander the Great. Stretching from Syria to the Indus River and comprising most of Alexander's realm, the Seleucid state was the most powerful of the Diadochi kingdoms that sprang up after Alexander's death. Quickly however, the Seleucids ran into trouble trying to maintain such an extended realm, facing constant warfare against the other Hellenistic states in the west and with unrest amongst their Iranian peoples in the east.