Al-Hadi (766-786)

"Abu Muhammad Musa ibn al-Mahdi al-Hadi (Arabic: أبو محمد موسى بن المهدي الهادي‎; 26 April 764 CE – 14 September 786 CE) better known by his laqab Al-Hadi (الهادي‎) was the fourth Arab Abbasid caliph who succeeded his father Al-Mahdi and ruled from 169 AH (785 CE) until his death in 170 AH (786 CE). His short reign ended with internal chaos and power struggles with his mother." - (en.wikipedia.org 12.12.2021)

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[Relation to person or institution] Al-Hadi (766-786)

Commissioned Harun al-Rashid (763-809) (

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Owned Academy of Sciences of the GDR (

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