Ioannes 337 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M VII |
| PmbZ No. | 2869 |
| Seal Sources | Zacos, G. and Veglery, A., Byzantine Lead Seals, vol. I (in 3 parts) (Basel, 1972). |
Ioannes 337 was the father of Gregorios 99: Zacos and Veglery 3117. He is recorded on his son's seal; for the text, see Gregorios 99.
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