Alid dynasties of northern Iran

Alid dynasties of northern Iran or Alavids (Persian: علویان طبرستان). In the 9th–10th centuries, the northern Iranian regions of Tabaristan, Daylam and Gilan, sandwiched between the Caspian Sea and the Alborz range, came under the rule of a number of Alid dynasties, espousing the Zaydi branch of Shia Islam.