Eulalios 1 was bishop of Zenonopolis in Isauria; he attended the Third Council of Constantinople (the Sixth Ecumenical Council) in 680 and 681 and was present at all eighteen sessions: Riedinger, pp. 18-828 (= Mansi XI 212-680). In the subscriptions to the statement of the faith, which condemned monotheletism, and to the Council, he is styled Εὐλάλιος ἐλέει Θεοῦ ἐπίσκοπος Ζηνωνουπόλεως Ἰσαυρίας: Riedinger, p. 794, line 22, p. 828, line 23 (= Mansi XI 653, 680). In the lists of those attending each session he is styled Εὐλαλίου ἐπισκόπου Ζηνωνουπόλεως: Riedinger, p. 18, line 17, p. 30, line 19, etc. (= Mansi XI 212, 220, etc.) (his see is sometimes called Zenopolis in both Greek and Latin texts of the Council). At the eighth session (7 March 681) he declared his acceptance of the doctrine of Two Natures, Two Wills and Two Energies as set out in documents from pope Agatho I and the Roman Council: Riedinger, p. 212, lines 16-17 (= Mansi XI 348).

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