Eustathios 57 | Prosopography of the Byzantine Empire |
| Floruit | VIII |
| PmbZ No. | 1757 |
| Titles | Bishop, unknown (office) |
| Seal Sources | Likhachev, N. P., Molivdovuly Grecheskogo Vostoka, ed. V. S. Shandrovskaia (Moscow, 1991) |
Eustathios 57 was bishop of a see whose name is not certain; owner of a seal dateable to the eighth century: Likhachev, Molivdovuly LXIV 14 (M-12048). The name and title read: Εὐσταθίῳ επισκ πολες.ς.του.
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