The Ziyarids, also spelled Zeyarids, are a Dailamite dynasty that rules in the Caspian sea provinces of Gorgan and Mazandaran from 931 to 1090 (also known as Tabarestan).

The founder of the dynasty is Mardavij (from 927 to 935), who takes advantage of a rebellion in the Samanid army of Iran to seize power in northern Iran.

He soon expands his domains and captures the cities of Hamadan, Isfahan, and half of the Kermanshah province and by 934 his troops even penetrate into Ahvaz.

His goal is to conquer Baghdad, remove the caliphate, be crowned in Ctesiphon and restore the Sassanid Empire.