A Zaydi Shia Alid emirate established in the Caspian mountain region of Tabaristan (Mazandaran), the first sustained independent Zaydi state and a seedbed for the later Buyid and Ziyarid dynasties.
Interrupted by a Samanid occupation in 900, restored in 914 by another Alid branch, and finally extinguished by a second Samanid conquest in 928; local Zaydi rule persisted longer in neighboring Daylam and Gilan.
Polity-specific primary-source edition covering exactly this Zaydi Alid line, verified on Open Library.