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.
At its greatest extent, it ruled much of present-day western and northern Iran. During the turn of the century, the kingdom attracted many scholars, with the most notable being al-Biruni.
Origins
The dynasty was descended from Vardanshah, leader of the Shahanshahvand tribe, which traced its descent back to the legendary king Arghush Farhadan, who was the ruler of Gilan, and lived during the time of Kai Khosrow. Vardanshah had a son named Ziyar, who married a sister of the Gilaki king Harusindan, who bore him a son named Mardavij. Mardavij later served another Gilaki military leader named Asfar ibn Shiruya, but later betrayed the latter and conquered Tabaristan, which led to the foundation of the Ziyarid dynasty, which he named after his father.
History
Mardavij then began aggressively expanding his territories, killing Asfar and capturing several important cities in Iran, such as Hamadan, Dinavar, Kashan, Isfahan, Shiraz and Ahvaz from the Abbasids. He further planned to restore the Sasanian Empire through conquering Baghdad and ousting the Abbasid Caliphate, but was instead murdered in 935. After Mardavij's death, his brother and general Vushmgir was crowned as the new Ziyarid ruler in Ray.
Hasan ibn Buya, one of the brothers of the Buyid ruler Ali ibn Buya, took advantage of Mardavij's death by seizing Isfahan from Ziyarid rule. The Samanids also took advantage of the opportunity, but were defeated by Vushmgir, who then wrested Gorgan from Samanid control.
Reign of Vushmgir 930s–960s
However, Vushmgir soon decided to acknowledge Samanid supremacy, and in 936 he also turned over Gorgan to Makan. Turning against Hasan, he retook Isfahan in 938. In 939 or 940 the Samanid governor Abu 'Ali Chaghani attacked Gorgan; Vushmgir sent Makan aid, but the city fell after a long siege. Abu 'Ali Chaghani then engaged Vushmgir in battle in Ray and defeated him, killing Makan in the process. Vushmgir fled to Tabaristan, but was faced there with a revolt by his governor of Sari, al-Hasan ibn al-Fairuzan, who was a cousin of Makan and blamed the Ziyarid for his death. Vushmgir defeated him, but al-Hasan convinced Abu 'Ali Chaghani to invade Tabaristan. Vushmgir was forced to recognize Samanid authority again. Hasan furthered the Ziyarid's troubles by retaking Isfahan in 940.
When Abu 'Ali Chaghani left for Samanid-held Khurasan, Vushmgir retook control of Ray. He then lost it for good in 943, to the Buyid Hasan. Returning to Tabaristan, he was defeated there by al-Hasan, who had previously occupied Gorgan. Vushmgir fled to the Bavandids of the mountains in eastern Tabaristan, then to the court of the Samanid Nuh I. Al-Hasan meanwhile allied with Hasan, but when Ibn Muthaj took Ray from the Buyids in 945, he recognized Samanid authority. Still, in 945 Vushmgir captured Gorgan with Samanid support, but did not manage to retain his rule there. It was only in 947 when he was able to take Gorgan and Tabaristan from al-Hasan with the help of a large Samanid army.
In 948 Hasan (who since the Buyids' entrance into Baghdad in 945 had used the title Rukn al-Dawla) invaded Tabaristan and Gorgan and took them from Vushmgir. While al-Hasan supported the Buyids, Vushmgir relied on his Samanid allies. Tabaristan and Gorgan changed hands several times until 955, when in a treaty with the Samanids, Rukn al-Daula promised to leave Vushmgir alone in Tabaristan. Peace between the two sides did not last long, however since in 958 Vushmgir briefly occupied Ray, which was Rukn al-Dawla's capital. Rukn al-Dawla later made a counter-attack, temporarily taking Gorgan in 960, then taking both Tabaristan and Gorgan for a short time in 962. He may have also taken Tabaristan and Gorgan in 966, but did not hold on to them for long.