Ioannes 584 | Prosopography of the Byzantine Empire |
| Floruit | VIII/IX |
| PmbZ No. | 3155* |
| Titles | Protospatharios (dignity) |
| Seal Sources | Gray Birch, W. de, Catalogue of Seals in the Department of Manuscripts in the British Museum (London, 1898) |
Ioannes 584 was protospatharios; owner of a seal dateable to the eighth or ninth century: Gray Birch, BMSeals 17784. The name and title read: Ἰωάννῃ πρωτοσπαθαρίῳ.
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