Literature in Iran
Persian is Iran's official language and the language of the country's ethnic majority (i.e., the Persians), and Persian literature has been the country's most influential literary tradition. Apart from Iran, Persian literature was used and developed further through several medieval Persianate societies in Asia Minor, Central Asia, and South Asia, and the language is still used widely in Central Asia (Tajikistan and Uzbekistan) and Afghanistan.
Languages of Azerbaijan
He then reports that Dari is the official language of the royal courts, and is from Khorasan and Balkh and eastern Iran; Parsi is the language of the Zoroastrian Moobeds, and is from Fars; Khuzi is the unofficial language of royalty and is from Khuzestan; and Seryani originates from Mesopotamia.