Kosmas 40 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | VIII |
| PmbZ No. | 4107 |
| Titles | Hypatos (dignity); Basilikos vestitor (office) |
| Seal Sources | Zacos, G. and Veglery, A., Byzantine Lead Seals, vol. I (in 3 parts) (Basel, 1972). |
Kosmas 40 was a hypatos and basilikos vestitor; owner of a seal dateable to the eighth century: Zacos and Veglery 405. The name and titles read: Κοσμᾷ ὑπάτῳ καὶ βασιλικῷ βεστήτορι.
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