Eastern Iranian languages
The Eastern Iranian languages are a subgroup of the
The living Eastern Iranian languages are spoken in a contiguous area, in eastern Afghanistan as well as the adjacent parts of western Pakistan,
Middle Persian/Dari spread around the Oxus River region, Afghanistan, and Khurasan after the Arab conquests and during Islamic-Arab rule. The replacement of the Pahlavi script with the Arabic script in order to write the Persian language was done by the Tahirids in 9th century Khurasan. The Persian Dari language spread and led to the extinction of Eastern Iranic languages like Bactrian, Khorezmian with only a tiny amount of Sogdian descended Yaghnobi speakers remaining among the now Persian speaking Tajik population of Central Asia, due to the fact that the Arab-Islamic army which invaded Central Asia also included some Persians who later governed the region like the Samanids. Persian was rooted into Central Asia by the Samanids.