1030.
The pre-Turkic Azerbaijani population spoke an Iranian language called the Old Azari language, which was gradually replaced by a Turkic language, now known as the Azerbaijani language from the 11th century onward until it became completely extinct in the 16th century. To distinguish it from the Turkic Azerbaijani or Azeri language, this Iranian language, is designated as the Azari language (or Old Azari language), because the Turkic language and people are also designated as "Azari" in the Persian language. However some linguists have also designated the Tati dialects of Iranian Azerbaijan and the Republic of Azerbaijan, like those spoken by the Tats, as a remnant of Azari. Locally, the possessions of the subsequent Seljuq Empire were ruled by atabegs, who were technically vassals of the Seljuq sultans, being sometimes de facto rulers themselves. Under the Seljuq Turks, local poets such as Nizami Ganjavi and Khagani Shirvani gave rise to a blossoming of Persian literature on the territory of present-day Azerbaijan. The next ruling state of the Jalayirids was short-lived and fell under the conquests of Timur.
The local dynasty of Shirvanshahs became a vassal state of Timur's Empire and assisted him in his war with the ruler of the Golden Horde Tokhtamysh. Following Timur's death two independent and rival states emerged: Kara Koyunlu and Ak Koyunlu. The Shirvanshahs returned, maintaining a high degree of autonomy as local rulers and vassals from 861 until 1539. During their persecution by the Safavids, the last dynasty imposed Shia Islam upon the formerly Sunni population, as it was battling against the Sunni Ottoman Empire.
Modern era
After the Safavids, the area was ruled by the Iranian dynasties of Afshar and Zand and briefly by the Qajars. However de facto self-ruling khanates emerged in the area, especially following the collapse of the Zand dynasty and in the early Qajar era. The brief and successful Russian campaign of
