Petros 21 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M/L VII |
| Dates | 681 (taq) / 681 (tpq) |
| PmbZ No. | 5944 |
| Variant Names | Petrus |
| Religion | Christian; Anti-monothelete |
| Locations | Appia (Phrygia Pacatiana) (officeplace); Appia (Phrygia Pacatiana); Constantinople |
| Occupation | Bishop |
| Titles | Bishop, Appia (Phrygia Pacatiana) (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) |
Petros 21 was bishop of Appia in Pacatiana; in 681 he attended the Third Council of Constantinople (the Sixth Ecumenical Council) and was present at the last eight sessions (sessions eleven to eighteen, from 20 March to 16 September): Riedinger II 2. 406-828 (= Mansi XI 460- 680). In the subscriptions to the statement of the faith, which condemned monotheletism, he is styled Πέτρος ἐλέει Θεοῦ ἐπίσκοπος πόλεως Ἀππίας: Riedinger II 2. 794, line 5 (= Mansi XI 652). In the subscriptions to the Council he is styled Πέτρος ἐλέει Θεοῦ ἐπίσκοπος πόλεως Ἀππίας ἐπαρχίας Πακατιανῆς: Riedinger II 2. 828, line 7 (= Mansi XI 680). The old Latin version at Riedinger II 2. 795, line 6 (= Mansi XI 651) calls his see "
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