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In page Bactria:

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After the death of Alexander, Bactria was annexed by his general, Seleucus I.[citation needed] The Seleucids lost the region after the region declared independence by the satrap Diodotus I; thus began the history of the Greco-Bactrian and Indo-Greek, Kingdoms. By the second century BC, Bactria was conquered by the Parthian Empire, and, in the early first century, the Kushan Empire, believed to be formed by the Yuezhi conquered the Bactrian territories.Bactrian (natively known as ariao, 'Iranian'),[4] an Eastern Iranian language, was the common language of Bactria and surroundings areas in ancient until early medieval times.