Ioannes 20 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M/L VII |
| Dates | 680 (taq) / 680 (tpq) |
| PmbZ No. | 3416 |
| Variant Names | Iohannes |
| Religion | Christian; Anti-monothelete |
| Locations | Hydruntum (Calabria) (officeplace); Hydruntum (Calabria); Rome |
| Occupation | Bishop |
| Titles | Bishop, Hydruntum (Calabria) (office) |
| Textual Sources | Constantinople, Third Council of (Sixth Ecumenical Council), ed. R. Riedinger, Concilium Universale Constantinopolitanum Tertium, ACO II.2. 1 (Berlin, 1990-1992); also cited from Mansi XI passim (conciliar) |
Ioannes 20 was bishop of Hydruntum (Otranto) in Calabria; he was one of the hundred and twenty-five Western bishops who attended the Council of Rome at Easter 680, and who subscribed the decree condemning monotheletism: Riedinger II 2. 142, lines 10-12 (= Mansi XI 299-300) (Ἰωάννης χάριτι Θεοῦ ἐπίσκοπος τῆς ἁγίας ἐκκλησίας Ἰδροῦντος ἐπαρχίας Καλαβρίας; in the old Latin version printed in Riedinger II 2. 143, line 10, his see is identified as "
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