Isa ibn Musa 1 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M VIII |
| PmbZ No. | 3476 |
| Variant Names | Ise Ibinmouse |
| Religion | Muslim |
| Ethnicity | Arab |
| Textual Sources | Theophanes Confessor, Chronographia, ed. C. de Boor, 2 vols. (Leipzig, 1883-85, repr. Hildesheim/NewYork, 1980); tr. and comm. C. Mango and R. Scott, The Chronicle of Theophanes Confessor, Oxford 1997 (chronicle) |
Isa ibn Musa 1's full name was Isa ibn Musa ibn Muhammad ibn Ali ibn Abdullah ibn al-Abbas; he was the nephew of the first two Abbasid caliphs, as-Saffah 1 and al-Mansour 1, but though designated their successor had to give up his claim as heir apparent to al-Mahdi 1. See Encyclopaedia of Islam, p. 88. Designated to succeed Aboulabas (as-Saffah 1) and Abdelas (al-Mansour 1) as caliph (τὴν ἀρχὴν) after the overthrow of the Umayyads: Theoph. AM 6241. Subsequently he was replaced as heir-apparent to al-Mansour 1 by the son of al-Mansour 1, al-Mahdi 1; Theophanes recounts that he fell ill and was given a drug by the doctor, Moses 1, on orders from al-Mansour 1, that made him comatose; in this state he was replaced as successor by the decision of an assembly of Arab leaders; after his recovery he was paid a large sum of gold in compensation: Theoph. AM 6256.
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