"ʿUmar ibn al-ʿAlā
Gouverneur in Ṭabaristān (155-164 AH/771-781).
Lit.: H. Malek, The Dābūyid Ispahbads and Early ʿAbbāsid Governors of Tabaristān: History and Numismatics (2004) 19 ff." - https://ikmk.smb.museum/ndp/person/12719, 13.07.2022
de