Persian language's history

The history of Iran language( Farsi),
The Achaemenid Persian Empire (550–330 BC) was the largest empire of the ancient world and it reached its greatest extent under Darius the Great and Xerxes the Great — famous in antiquity as the foe of the classical Greek states (See Greco-Persian Wars). It was a united Persian kingdom that originated in the region now known as Pars province (Fars province) of Iran.
It was formed under Cyrus the Great, who took over the empire of the Medes, and conquered much of the Middle East, including the territories of the Babylonians, Assyrians, the Phoenicians, and the Lydians
Iran Has a great Empire for over 2500 years and control basically not only the middle East ,but also to Far East borders including some part of India and North border went far to most South Ex-soviet union and West boarder to Turkey.

Iranian language has 3 dialect which one calls Dari which speaks in Afghanistan and One speaks in center of Asia in Ex-Soviet Unions and another one speaks in ran( Persia).
Iran is a multilingual country inside of Iran there are some minorities ,ethnic groups who speaks Turkish, Kurdish and even Arabic even.

Persian appeared fairly standardized by the tenth century with a bit dialect on it and mostly appeared in Poems and should say thanks to our great poet Firdausi who made it this language alive for second time after Barber and Arab attack in order expanding Islam’s religion in neighboring countries, mainly in Persian empire which the result was not what was expected and as a result destroyed a lot of libraries and basically culture of Iran ,unfortunately.

Persian was cultivated at the courts of the Ottoman rulers, several of whom are known for composing Farsi poetry. Urdu also developed under heavy Persian influence. Persian first entered India with the conquest of North West India by Ghaznavid armies in the eleventh century. Four centuries later, Persian was chosen as the court language by the Mogul rulers, who were major patrons of Persian literature, unlike the contemporary Safavids in Iran.