Konstantinos 340 | Prosopography of the Byzantine Empire |
| Floruit | VIII/IX |
| PmbZ No. | 4044 |
| Titles | chartoularios (office) |
| Seal Sources | Gray Birch, W. de, Catalogue of Seals in the Department of Manuscripts in the British Museum (London, 1898) |
Konstantinos 340 was chartoularios; owner of a seal dated by Gray Birch to the tenth century but assigned in PmbZ 4044 to the eighth or ninth: Gray Birch 17579. The name and title read: Κωνσταντίνῳ χαρτουλαρίῳ.
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