. . "ʿUmar ibn al-ʿAlā"@de . "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."@de . "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."@en . . "ʿUmar ibn al-ʿAlā"@de . . . "Münzherr"@de . "Authority"@en . . "2024-05-10"^^ . "2024-05-10"^^ .