Ioannes 121 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | L VIII |
| Dates | 787 (taq) / 787 (tp) |
| PmbZ No. | 3076 |
| Religion | Christian; Iconophile |
| Locations | Lithoprosopon (Europa); Lithoprosopon (Europa) (officeplace); Nikaia |
| Occupation | Bishop |
| Titles | Bishop, Lithoprosopon (Thrace) (office) |
| Textual Sources | Nikaia, Second Council of (Seventh Ecumenical Council, a. 787) (Mansi XII-XIII) (conciliar) |
Ioannes 121 was bishop of Lithoprosopon (location uncertain; possibly in Europa); in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council); he is attested only at the seventh session on 13 October 787, where he is styled Ἰωάννου ἐπισκόπου Λιθοπροσώπου: Mansi XIII 373. At the seventh session he subscribed the statement of the faith adopted by the Council and is styled Ἰωάννης ἀνάξιος ἐπίσκοπος Λιθοπροσώπου: Mansi XIII 388. He is named among bishops from Europa. Possibly to be identified with Ioannes 101.
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