Andreas 8 was bishop of Methymna in Lesbos; he attended the Third Council of Constantinople (the Sixth Ecumenical Council) in 680 and 681 and was present at all eighteen sessions: Riedinger II 2. 16-825 (= Mansi XI 212-673). In the subscriptions to the statement of the faith, which condemned monotheletism, and to the Council, he is styled Ἀνδρέας ἐλέει Θεοῦ ἐπίσκοπος τῆς Μεθυμναίων πόλεως τῆς Λεσβίων νήσου or similar: Riedinger II 2. 736, line 17, 786, line 5, 825, line 23, 894, line 1 (= Mansi XI 696, 645, 673, cf. 693). In the lists of those attending each session he is styled Ἀνδρέου ἐπισκόπου Μεθύμνης: Riedinger II 2. 16, line 33, 30, line 2 (= Mansi XI 212, 220, etc.). At the eighth session (7 March 681) he declared his acceptance of the doctrine of Two Wills and Two Energies as set out in documents from pope Agatho 1 and the Roman Council: Riedinger II 2. 200, line 12 (= Mansi XI 337). He was among the signatories to the copy of the definition of the faith sent to the bishop of Rome, Agatho 1: Riedinger II 2. 894, line 1 (= Mansi XI 693).

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