may 16, 823 - Bizist Coup

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During the Late Sasanian Turmoil, the Sassanid Shahs' power become more and more weakness, the frontier fallen into lots of revolts and warlords, palace coup often launched by the generals and nobals, and the Shah deposed and changed frequently.

Year 823, Mihr-Gushnasp general Bizist and lower nobals and generals launched a success palace coup against the Wuzurg framadar Karin, killed Shah Kavad IV whom been put on the throne by Karin and enthroned the Shah's younger bother, Yazdegerd; and Bizist then become new Wuzurg framadar.

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