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| Person name | Ishoʿyahb III of Adiabene |
| Sex | Male |
| Religious affiliation | East Syrian |
| Religious status | Upper clergy |
| Death date range | 659 - 659 |
| Floruit date range | 649 - 659 |
| Notes & references | Patriarch of the Church of the East (649-59). He conducted liturgical reforms although he may not in fact have authored all the liturgical texts attributed to him in the manuscripts. |