Theophylaktos 21 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | L VIII |
| Dates | 787 (taq) / 787 (tpq) |
| Variant Names | Theophylactus |
| Religion | Christian |
| Locations | Amyzon (Caria) (officeplace); Amyzon (Caria); Nikaia |
| Textual Sources | Nikaia, Second Council of (Seventh Ecumenical Council, a. 787) (Mansi XII-XIII) (conciliar) |
Theophylaktos 21 represented the see of Amyzon in Caria at the first session of the Second Council of Nikaia (the Seventh Ecumenical Council), on 24 September 787: Mansi XII 998 (Θεοφυλάκτου τοποτηρητοῦ Ἀμυζόνος; the Latin version, at XII 997, reads: "
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