Konstantinos 309 | Prosopography of the Byzantine Empire |
| Floruit | VII |
| PmbZ No. | 3748 |
| Seal Sources | Laurent, V., Les sceaux byzantins du médaillier Vatican (Vatican City, 1962) |
Konstantinos 309 was the owner of a seal dateable to the seventh century: Laurent, Vat., Appendix 4. The text reads: Κωνσταντίνου.
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