While the reign of Haroon was on the one hand the rise of fine arts and architecture, on the other hand the foundation of the decline of the great Abbasid Caliphate was laid in the same period which was further enhanced by Haroon’s efforts to establish his empire. Tried to divide into two sons Mamun and Amin.
Under Aaron’s rule, pro-Umayyad tribes in Syria revolted, while in Egypt, unrest began due to mismanagement and heavy taxes, which led to uprisings. On the other hand, a branch of the Umayyads had established its caliphate in Spain before Aaron in 755, while the Idriss established their government in Morocco in 788.
In the year 800, Tunisia also fell into the hands of the majority, while unrest remained in Yemen and the Kharijites continued to raise their heads in Dailum, Kerman, Persia and Sistan. The biggest uprising took place in Khurasan. To subdue it, the Abbasids later had to move their capital to Khorasan. On the other hand, the Byzantine Empire was also a constant rival of the Abbasids
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