Kosmas 57 | Prosopography of the Byzantine Empire |
| Floruit | VIII/IX |
| PmbZ No. | 4120 |
| Locations | Hellas; Hellas (officeplace) |
| Titles | Dioiketes, Hellas (office) |
| Seal Sources | Dumbarton Oaks, A Catalogue of the Byzantine Seals at Dumbarton Oaks and in the Fogg Museum of Art, eds., J. Nesbitt and N. Oikonomides (Washington, DC, 1991-) |
Kosmas 57 was a dioiketes of Hellas; owner of a seal dateable to the eighth or ninth century: DOSeals II 8.6. Obv.: cruciform monogram of Κύριε βοήθει with .ω - σω - .. - λω in the corners. Rev.: +Κος - μα δ. - ικ' Ε. - ..'. The text of the reverse perhaps reads: Κοσμᾷ διοικητῇ Ἑλλάδος.
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