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.
Iranian languages
The Iranian languages all descend from a common ancestor: the so-called Proto-Iranian which itself evolved from Proto-Indo-Iranian. This ancestor language is speculated to have origins in Central Asia and the Andronovo Culture is suggested as a candidate for the common Indo-Iranian culture around 2000 BC.