The name takes its origins from Alavids (سلسله علویان طبرستان in Persian), Shia emirates based in Mazandaran (Tabaristan) of Iran.
His Khurasani governor Yazid continued expansion into mountainous parts of Iran such as Tabaristan.
When the Sasanian Empire fell, Yazdegerd III ordered Adhar Valash to cede the dominion to spahbed Gil Gavbara in 645 CE, while western and Southern Gilan and other parts of Gil's domain merged under the name of Tapuria.
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The Gashnaspians ruled the region until 528 CE, when, after a long period of fighting, the Sasanian King Kavadh I defeated the last Gashnaspian king.
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Pietro Della Valle, who visited a town near Pirouzcow in Mazandaran, noted that Mazandarani women never wore the veil and didn't hesitate to talk to foreigners.
Qaren got the area of Jebel al-Qaren or Koh-e Qaren (“Mount of Qaren”) in Mazanderan and in 565 AD was made espehbadh (hereditary governor) of Tabaristan (r. 565–602), where his line ruled as Qarenid Dynasty until the end of the ninth century.
Actually, the Zaydi Revolt continued until 785 and re-erupted in Tabaristan under the leadership of the Zayd ibn Ali's son, "Hasan ibn Zayd’ūl-Alavī." His revolt attracted many supporters, among them the ruler of Rustamids, the son of "Farīdūn" (a descendant of Rostam Farrokhzād) "Abd al-Rahmān ibn Rustam" who was well known by the name of "Bānū-Bādūsyān," worth mentioning.
Hasan ibn Zayd was the son of Zayd who gave origin to the Zaydids in Tabaristan (Alavids).
Farrukhzad, the previously minister of Yazdegerd, and ruler of Tabaristan, managed to repel the Arabs with the aid of Gil Gavbara and make a treaty with them.
On his way to Tabaristan, he met the Arab general Nu'aym near Qazvin, and made peace with him.
Abu Muḥammad al-Ḥasan ibn ‘Alī ibn al-Ḥasan ibn ‘Alī ibn ‘Umar al-Ashraf ibn ‘Alī Zayn al-‘Ābidīn (Medina, ca. 844 – Amul, January/February 917), better known as al-Ḥasan al-Uṭrūsh ("the Deaf"), was an Alid Shia missionary of the Zaydi sect who re-established Zaydid rule over the province Tabaristan in northern Iran in 914, after fourteen years of Samanid rule.
In almost all the Iranian provinces, according to Al Masudi, fire temples were to be found – the Madjus he says, venerate many fire temples in Iraq, Fars, Kirman, Sistan, Khurasan, Tabaristan, al Djibal, Azerbaijan and Arran.
The dynasty was founded by the founder of the Bvads, Baw Ka'usiyeh, the first prince of Tabaristan (r. 665–680) son of Kawus, son of Kavadh I, the Sasanian Emperor.
Tabarsi was born in the year 468 AH (1073 AD/CE) in Tabaristan province or some scholars said in Tafresh a city which was named at those days Tabres, Iran.