Kosmas 3 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | M VIII |
| Dates | 742 (taq) / 768 (ob.) |
| PmbZ No. | 4094 |
| Variant Names | Cosmas |
| Religion | Monothelete; Anti-monothelete; Iconophile |
| Locations | Alexandria (Egypt) (officeplace); Alexandria (Egypt) |
| Occupation | Bishop |
| Titles | Archbishop, Alexandria (Egypt) (office); Bishop, Alexandria (Egypt) (office); Patriarch, Alexandria (Egypt) (office); Pope, Alexandria (Egypt) (office) |
| Textual Sources | Nikaia, Second Council of (Seventh Ecumenical Council, a. 787) (Mansi XII-XIII) (conciliar); Theophanes Confessor, Chronographia, ed. C. de Boor, 2 vols. (Leipzig, 1883-85, repr. Hildesheim/NewYork, 1980); tr. and comm. C. Mango and R. Scott, The Chronicle of Theophanes Confessor, Oxford 1997 (chronicle) |
Kosmas 3 was patriarch of Alexandria from 742 to 768 (Grumel, Chronologie, p. 443). Patriarch of Alexandria, in 743 he and the city of Alexandria abandoned the doctrine of monotheletism, which had prevailed there since the time of Heraklios I and the patriarch of Alexandria, Kyros 2, and became "orthodox" (Κοσμᾶς ὁ πατριάρχης Ἀλεξανδρείας ὠρθοδόξησε σὺν τῇ πόλει αὐτοῦ ἐκ τῆς τῶν Μονοθελητῶν κακοδοξίας): Theoph. AM 6234. Patriarch of Alexandria at Pentecost, 22 May 763, he joined the patriarchs of Antioch and Jerusalem, Theodoros 10 and Theodoros 12, with their bishops in anathematising bishop Kosmas of Epiphaneia (Kosmas 4) for iconoclasm: Theoph. AM 6255.
Patriarch of Alexandria; Kosmas 3 was dead by 787; he, Theodoros 10 and Theodoros 12 received one another's synodika: Mansi XII 1135.
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