Late Sasanian Turmoil (apr 18, 770 – oct 20, 860)

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In the second intermediate era of Sasanian dynasty, the Sassanid Persia relied on the aid of Tang China and the wealth from Silk Road heavily; Bahram VI's action on retaking Mesopotamia doesn't change it in a short period as the region during his reign still in rebuild from decades of confilct; while the An Lushan Rebellion destroy Tang Hegemon and the stability of whole Silk Road, causing a Economic Crisis in Sassanid Persia and the collapse of it.
Fallow the Khorasan Rebellion of 770, the Sasanian Persia lost its control over Khorasan, Chorasmia, Seyansih and Gurgan, those region fallen into small states ruled by ex-governor or rebel. The Sasanian central itself also fallen in decades of political struggles, as powerful Wuzurg framadar and Shahanshah struggle for palace power and coups happen every few years. In most of this period, the power of Sasanian central shrink to a small region around Spahan, military action to restore full control of the empire become a tool of part of political struggles.
The long time turmoil dissolved the Sasanid social class system, bring the lower noble then lower general into the core of power, led to the took of power of Laith, whom came as a civilian through military achievements and power struggles; by ousted opponents in inner and recover the empire territory in outer, Laith end the Late Sasanian Turmoil and establish the Saffarid dynasty.

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