Persian language, despite all the dialects and sometimes local (regional) languages in Iran, has been the place of various historical, scientific, literary, religious and artistic reflections of Iranians throughout history as the educational and written lingua franca of Iranian people. The role of the Shahnameh in gaining the power of the Persian language is undeniable, because it preserved Persian words like a great treasure, which was one of the requirements for the Persian language to regain its status. Compilation of Shahnameh in Persian caused the Arabic language to lose its status as an administrative and cultural language, and Farsi took over its place. By using the Persian language and reviving its vocabulary in the Shahnameh, Ferdowsi modernized the culture, civilization, and national identity of Iran. Fath Ali Shah is considered to be contemporary with the renaissance period of Iran's poetry and literature, that is, the Ghaznavid period and the time when Ferdowsi's Shahnameh was written. In the second half of the twelfth century - at the end of the Afshar period and shortly before Fath Ali Shah gathered the orators and the eloquents in his court - the minds of the people were annoyed and bored by the arrogant style of the Mughal and Timurid periods and excessive play on words and meticulousness of the Indian style and consequently a relatively important movement in the Persian language and poetry began. Modernity is a concept that is always considered the outcome of the constitutional revolution, but it must be said that the onset of this movement began in the Qajar era and this period is considered the advent of the evolution of the Persian language.