Ioannes 582 | Prosopography of the Byzantine Empire |
| Floruit | M/L VIII |
| PmbZ No. | 3128 |
| Locations | Hydruntum (Calabria) (officeplace) |
| Titles | Doux, Hydruntum (Calabria) (office) |
| Seal Sources | Laurent, V., Les sceaux byzantins du médaillier Vatican (Vatican City, 1962) |
Ioannes 582 was doux of Hydruntum (Otranto); owner of a seal probably dateable to the middle or late eighth century (see V. von Falkenhausen, Untersuchungen über die byzantinische Herrschaft in Süditalien von 9. bis ins 11. Jahrhundert (Wiesbaden, 1967), pp. 6-8): Laurent, Vat. 108. The name and title read: Ἰωάννου δουκὸς Ὑδροῦντος.
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