Theodoros 40 was bishop of Kaisareia in Bithynia; in 681 he attended the Third Council of Constantinople (the Sixth Ecumenical Council) and was present at two of the last three sessions (sessions sixteen and eighteen, on 9 August and 16 September): Riedinger, pp. 690-827 (= Mansi XI 616-678). In the subscriptions to the statement of the faith, which condemned monotheletism, he is styled Θεόδωρος ἐλέει Θεοῦ ἐπίσκοπος τῆς Καισαρέων πόλεως τῆς Βιθυνῶν ἐπαρχίας: Riedinger, p. 790, line 19 (= Mansi XI 649). The old Latin version calls him "Theodorus misericordia dei episcopus Cesareae ciuitatis Bitiniae regionis": Riedinger, p. 791, line 22 (= Mansi XI 650). In the signatures to the Council he is styled Θεόδωρος ἐλέει Θεοῦ ἐπίσκοπος Καισαρείας Βιθυνίας : Riedinger, p. 827, line 16 (= Mansi XI 677). The old Latin version, printed here only in the Mansi edition, calls him "Theodorus misericordia Dei episcopus Caesareae civitatis Bithyniae regionis": Mansi XI 678. In the lists of those present at each session he is styled Θεοδώρου ἐπισκόπου Καισαρείας Βιθυνίας: Riedinger, p. 690, line 11, p. 760, line 19 (= Mansi XI 616, 628).

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