Nikolaos 21 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | VII |
| PmbZ No. | 5536 |
| Religion | Christian |
| Occupation | Bishop |
| Titles | Bishop, unknown (office) |
| Seal Sources | Laurent, V., Le corpus des sceaux de l'empire byzatin, V, 1-3, L'église (Paris, 1963-72); II, L'administration centrale (Paris, 1981) |
Nikolaos 21 was bishop of an unnamed see; owner of a seal dateable to the seventh century: Laurent, Corpus V 1, no. 999. Obv.: square monogram of Νικολάου. Rev.: +επις - κοπου - δουλο - υ Χ(ριστο)υ.
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