The Ziyarid dynasty was an Iranian dynasty of Gilaki origin that ruled Tabaristan from 931 to 1090 during the Iranian Intermezzo period. The empire rose to prominence during the leadership of Mardavij. After his death, his brother Vushmgir and his Samanid allies led the dynasty in wrestling for control over territory against the Buyids in the early- to mid-10th century. When Vushmgir died, his sons Bisutun and Qabus fought for influence. Qabus would eventually outlive his brother and ruled the kingdom. However, Qabus was placed in exile from 980 to 998 by the Buyid ruler, Adud al-Dawla who would then dominate Tabaristan, the heartland of Ziyarid power. A succession of other rulers came to rule the kingdom with Ghaznavid support in the early 11th century. The Nizari Ismaili state invaded and ended Ziyarid rule in 1090.

Persian, also known by its endonym Farsi or Parsi, is a Western Iranian language belonging to the Iranian branch of the Indo-Iranian subdivision of the Indo-European languages. Persian is a pluricentric language predominantly spoken and used officially within Iran, Afghanistan, and Tajikistan in three mutually intelligible standard varieties, respectively Iranian Persian, Dari Persian, and Tajiki Persian. It is also spoken natively in the Tajik variety by a significant population within Uzbekistan, as well as within other regions with a Persianate history in the cultural sphere of Greater Iran. It is written officially within Iran and Afghanistan in the Persian alphabet, a derivative of the Arabic script, and within Tajikistan in the Tajik alphabet, a derivative of the Cyrillic script.