Tychon 1 was bishop of Kition in Cyprus; in 681 he attended the Third Council of Constantinople (the Sixth Ecumenical Council) and was present at each of the last five sessions (sessions fourteen to eighteen, from 5 April to 16 September); he and the bishop of Soloi, Stratonikos 1, are regularly associated as coming from Cyprus, and their signatures occur together: Riedinger, pp. 634-825 (= Mansi XI 585-673). In the subscriptions to the statement of the faith, which condemned monotheletism, and to the Council, he is styled Τύχων ἐλέει Θεοῦ ἐπίσκοπος πόλεως Κιτίου (so Riedinger, p. 786, line 15 (= Mansi XI 645); Riedinger, p. 825, line 10 (= Mansi XI 673) reads: ἐπίσκοπος τοῦ Κιτίου) τῆς Κυπρίων νήσου: Riedinger, p. 786, line 15, p. 825, line 10 (= Mansi XI 645, 673). The old Latin version printed in Riedinger calls his see "ciuitatis Cythii Cypri insulae": Riedinger, p. 787, line 15 (= Mansi XI 646). In the lists of those present at each session he and Stratonikos are regularly styled Στρατονίκου ἐπισκόπου Σόλων καὶ Τύχωνος ἐπισκόπου τοῦ Κιτίου, ἀμφοτέρων τῆς συνόδου τυγχανόντων τῆς φιλοχρίστου τῶν Κυπρίων νήσου: Riedinger, p. 634, lines 2-3, pp. 654, line 27-656, line 2, p. 670, lines 1-2, p. 688, lines 18-19, p. 708, lines 19-20, p. 758, lines 13-14 (= Mansi XI 585, 597, 605, 613, 626, 629).

During the fourteenth session Tychon 1 and the other Cypriote bishops Theodoros 36 and Stratonikos 1 produced a collection of passages from the Fathers, especially from St Athanasios, in support of the doctrine of Two Wills and Two Energies, as well as a codex containing sermons of Athanasios which they had discovered in Constantinople: Riedinger, pp. 654-656 (= Mansi XI 596-597). His name occurs in the list of bishops printed in Riedinger, p. 738, line 10 (= Mansi XI 697).

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