Demetrios 23 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | IX/X |
| Religion | Christian |
| Locations | Kyzikos (residence); Kyzikos; Kyzikos (officeplace) |
| Occupation | Bishop |
| Titles | Metropolitan, Kyzikos (office) |
| Seal Sources | Konstantipoulos, K.M., Byzantiaka Molybdoboulla tou en Athenais Ethnikou Nomismatikou Mouseiou (Athens, 1917); repr. from JIAN 5-10 (1902-07) |
Demetrios 23 was metropolitan bishop of Kyzikos; owner of a seal dateable to the ninth or tenth century: Konstantopoulos, JIAN 9, 122e. The name and title read: Δημητρίῳ μ[η]τροπο[λί]τῃ Κυζ[ί]κου.
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