Ioulianos 21 | Prosopography of the Byzantine Empire |
| Floruit | VIII |
| PmbZ No. | 3541 |
| Religion | Christian |
| Occupation | Cleric |
| Titles | Subdeacon (office) |
| Seal Sources | Laurent, V., Les sceaux byzantins du médaillier Vatican (Vatican City, 1962) |
Ioulianos 21 was a subdeacon; owner of a seal dateable to the eighth century: Laurent, Vat. 167. The name and title read: Ἰουλιανῷ ὑποδιακόνῳ.
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