Ioannes 139 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | L VIII |
| Dates | 787 (taq) / 787 (tpq) |
| PmbZ No. | 3058 |
| Religion | Christian; Iconophile |
| Locations | Hagia Sophia (Constantinople) (officeplace); Constantinople (residence); Constantinople; Nikaia |
| Occupation | Deacon |
| Titles | Deacon (office); Kankellarios, Hagia Sophia (Constantinople) (office) |
| Textual Sources | Nikaia, Second Council of (Seventh Ecumenical Council, a. 787) (Mansi XII-XIII) (conciliar) |
Ioannes 139 was a deacon of the Great Church (Hagia Sophia) of Constantinople and cancellarius; in 787 he was present at the Second Council of Nikaia (the Seventh Ecumenical Council) and is attested at the sixth session, on 6 October 787, when he was one of the readers: Mansi XIII 204 (Ἰωάννης διάκονος καὶ σακελλάριος (sic); the Latin version, at XIII 203, calls him "
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