After their defeat in 928 AD by Samanid empire Alavids dispersed into three main branches: the main brunch was absorbed into the conquering Samanid empire; second moved up north following the caspian sea to present day Azerbaijan; the third branch took refuge in northern part of Armenia (what is now Dzoramut/Norashen territories).
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.
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Although the Samanid force was far superior in numbers and equipment, Hasan managed to inflict a crushing defeat upon it in December 913 at Burdidah on the river Burrud west of Chalus.