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.
Greater Iran
As an example, the Persian language (referred to, in Persian, as "Farsi") was the main literary language and the language of correspondence in Central Asia and Caucasus prior to the Russian occupation, Central Asia being the birthplace of modern Persian language. Furthermore, according to the British government, Persian language was also used in Iraqi Kurdistan, prior to the British Occupation and Mandate in 1918-1932.