sentences:  Bavand dynasty
  
  The Bavand dynasty () (also spelled Bavend), or simply the Bavandids, was an Iranian dynasty that ruled in parts of Tabaristan (Mazandaran) in what is now northern Iran from 651 until 1349, alternating between outright independence and submission as vassals to more powerful regional rulers.The dynasty itself traced its descent back to Bav, who was alleged to be a grandson of the Sasanian prince Kawus, brother of Khosrow I, and son of the shah Kavad I (ruled 488–531), who supposedly fled to Tabaristan from the Muslim conquest of Persia.