Aspects of this topic are discussed in the following places at Britannica.
Soon afterward (c. 290–280 bc) the two eastern provinces of Margiana and Aria suffered an invasion by nomads. But the invasion was repelled, and the nomads were pushed back beyond the Jaxartes. Demodamas, a general to the first two Seleucid kings, crossed the river and even put up altars to Apollo, ancestor of the dynasty. Alexandria in Margiana and Heraclea in Aria, founded by...
...by force. His assassination of Bardiya was followed, particularly in the eastern provinces, by widespread revolts, which threatened to disrupt the empire. In Susiana, Babylonia, Media, Sagartia, and Margiana, independent governments were set up, most of them by men who claimed to belong to the former ruling families. Babylonia rebelled twice and Susiana three times. In Persia itself a certain...
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