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In page Bactria:

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After the death of Alexander, Bactria fell to his general, Seleucus I.[citation needed] The Seleucids lost the region to the satrap Diodotus I, when he declared independence; thus marking the beginning of the Greco-Bactrian and Indo-Greek Kingdoms. By the 2nd century BC, Bactria was conquered by the Parthian Empire, and, in the early 1st century, by the Kushan Empire, believed to have been founded by the Yuezhi. Bactrian (natively known as ariao, 'Iranian'),[4] an Eastern Iranian language, was the common language of Bactria and the surroundings areas, from ancient until early medieval times.