Analysis of information sources in references of the Wikipedia article "ภาษาเปอร์เซีย" in Thai language version.
Among other indigenous peoples of Iranian origin were the Tats, the Talishes and the Kurds.
The Iranian Peoples (Ossetians, Tajiks, Tats, Mountain Judaists)
All this affected translation activities in Persian, seriously undermining the international character of the language. The problem was compounded in modern times by several factors, among them the realignment of Central Asian Persian, renamed Tajiki by the Soviet Union, with Uzbek and Russian languages, as well as the emergence of a language reform movement in Iran which paid no attention to the consequences of its pronouncements and actions for the language as a whole.
Since the Arab conquest of the country in 7th century AD, many loan words have entered the language (which from this time has been written with a slightly modified version of the Arabic script) and the literature has been heavily influenced by the conventions of Arabic literature.
(...) Persian, the language originally spoken in the province of Fārs, which is descended from Old Persian, the language of the Achaemenid empire (6th–4th centuries B.C.E.), and Middle Persian, the language of the Sasanian empire (3rd–7th centuries C.E.).
There are numerous reasons to study Persian: for one thing, Persian is an important language of the Middle East and Central Asia, spoken by approximately 70 million native speakers and roughly 110 million people worldwide.