Hasan ibn Zayd
Hasan ibn Zayd, known as Great Dai, (born early 8th century, died 6 January 884) was king of the Tabaristan's Alids. He rebelled in Tabaristan (in 864) and fought with Abbasides, Taherian and the Saffarids dynasty. He created an Alavids dynasty.
Hassan ibn Zayd died in Amol.
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- ʿALIDS: Ecyclopedia Iranica