تاريخ اللغة المازاندرانية Mazandarani

Among the living Iranian languages, Mazandarani has one of the longest written traditions, from the tenth to the fifteenth century. This status was achieved during the long reign of the independent and semi-independent rulers of Mazandaran in the centuries after the Arab invasion.[3]

The rich literature of this language includes books such as Marzban Nameh (later translated into Persian) and the poetry of Amir Pazevari. The use of Mazandarani, however, has been in decline. Its literary and administrative rank was lost to Persian perhaps long before the ultimate integration of Mazandaran into the national administration in the early seventeenth century.[4]
Iran main languages

The Mazandarani language is closely related to Gilaki and the two languages have similar vocabularies. In 1993, according to Ethnologue, there were more than three million native speakers of Mazandarani, speaking different dialects such as Gorgani, Ghadikolahi and Palani.[5]