Ioannes 455 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M IX |
| Dates | 859 (tpq) / 867 (taq) |
| PmbZ No. | 3307 |
| Locations | Nikomedeia; Nikomedeia (residence); Nikomedeia (officeplace) |
| Occupation | Bishop |
| Titles | Bishop, Nikomedeia (Bithynia) (office); Metropolitan, Nikomedeia (Bithynia) (office) |
| Textual Sources | Photius, Epistulae, ed. B. Laourdas and L. G. Westerink, 3 vols. (Leipzig, 1983-85) (letters) |
Ioannes 455 was metropolitan bishop of Nikomedeia, he was the addressee of a letter from the patriarch Photius (Photios 1), written between 859 and 867, possibly between April 862 and April 866; he is criticised by Photios 1 for his foolishness: Photius, Ep. 17 (I 68 Laourdas-Westerink) (addressed Ἰωάννῃ μητροπολίτῃ Νικομηδείας). He was soon afterwards succeeded by Georgios 223, and presumably either died or was dismissed by Photios 1. Possibly identical with Ioannes 181.
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