Ioannes 554 | Prosopography of the Byzantine Empire |
| Floruit | M/L VII |
| PmbZ No. | 2866 |
| Religion | Christian |
| Locations | Blachernai (Church of, Constantinople) (officeplace) |
| Occupation | Deacon |
| Titles | Deacon, Blachernai (Constantinople) (office) |
| Seal Sources | Laurent, V., Le corpus des sceaux de l'empire byzatin, V, 1-3, L'église (Paris, 1963-72); II, L'administration centrale (Paris, 1981) |
Ioannes 554 was deacon of Blachernai (Constantinople); owner of a seal dateable to the middle or late seventh century: Laurent, Corpus V 2, no. 1199. The name and title read: Ἰωάννῳ διακόνῳ Βλαχερνῶν.
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