The Mazandaranis never compromised with Kopad and he soon left the region, but he placed Zarmehr on the throne in 537 CE. As a native of the region, he became popular. Zarmehr traced his genealogy to Kaveh, the legendary smith. During the reign of the Zarmehrians many people gradually converted to Zoroastrianism, and the language of the Mazanderanis was somewhat altered.
When the Sassanid empire fell, Yazdegerd III escaped to Tapuria to make use of the Mazanderani's bravery and resistance to repel the Arabs. By his order, AdarVelash (the last Zarmehrian king) ceded the dominion to Spahbed Gil Jamaspi in 645 CE, while western and Southern Gilan and other parts of Gil's domain merged under the name of Tapuria. He then chose Amol as capital of United Tapuria in 647 CE. The dynasty of Gil was known as Gavbareh in Gilan, and as the Dabuyans in eastern Tapuria.
Tabaristan was one of the last parts of Persia to fall to the Muslim Conquest, maintaining resistance until 761 (cf. Khurshid of Tabaristan). Even afterwards, Tabaristan remained virtually independent of the Caliphate.
Farrukhan the Great (the fourth king of the Dabuyans) expanded Tapuria to eastern parts of today's Turkmenistan and repulsed the Turks around 725 CE.
The area of Tabaristan quickly gained a large Shi'ite element, and by 900, a Zaydi Shi'ite kingdom was established under the Alavids. under the Alavids.
While the Dabuyans were in the Plainy regions, the Sokhrayans governed the mountainous regions. Venday Hormuzd ruled the region for about 50 years until 1034 CE. After 1125 CE, (the year Maziar was assassinated by subterfuge) an increase in conversion to Islam was achieved, not by the Arab Caliphs, but by the Imam's ambassadors.
Mazandaranis and Gilaks were one of the first groups of Iranians to convert directly to Shia Islam.
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