Analysis of information sources in references of the Wikipedia article "Azéri" in French language version.
« Safavid power with its distinctive Persian-Shiʻi culture, however, remained a middle ground between its two mighty Turkish neighbors. The Safavid state, which lasted at least until 1722, was essentially a "Turkish" dynasty, with Azeri Turkish (Azerbaijan being the family's home base) as the language of the rulers and the court as well as the Qizilbash military establishment. Shah Ismail wrote poetry in Turkish. The administration nevertheless was Persian, and the Persian language was the vehicle of diplomatic correspondence (insha'), of belles-lettres (adab), and of history (tarikh). »
« Until 1918, when the Musavat regime decided to name the newly independent state Azerbaijan, this designation had been used exclusively to identify the Iranian province of Azerbaijan. »