Theodoros 23 was priest and topoteretes (acting bishop) of the see of Jerusalem; at the Third Council of Constantinople (the Sixth Ecumenical Council) in 680 and 681 he was represented by a priest of the church of the Anastasis at Jerusalem, Georgios 16: Riedinger, p. 778, lines 14-16 (= Mansi XI 640) (Θεοδώρου τοῦ θεοφιλεστάτου πρεσβυτέρου καὶ τοποτηρητοῦ τοῦ ἀποστολικοῦ θρόνου τῆς ἁγίας Χριστοῦ τοῦ Θεοῦ ἡμῶν πόλεως Ἱεροσολύμων; cf. Riedinger, p. 822, lines 19-21, p. 891, lines 2-4 (= Mansi XI 669 and 688) for a similar title). In the list of those attending each session Georgios 16 is styled the apokrisiarios of Θεοδώρου τοῦ ὁσιωτάτου τοποτηρητοῦ τοῦ θρόνου Ἱεροσολύμων: Riedinger, p. 16, lines 11-12, p. 28, lines 15-16, etc. (= Mansi XI 209, 217, etc.). He was presumably anti-monothelete, since Georgios 16 subscribed the statement of the faith condemning monotheletism: Riedinger, p. 778, lines 14-16 (= Mansi XI 640). After the Council a copy of the statement of the faith agreed by the Council was sent to the see of Jerusalem, then under him, via Georgios 16: Riedinger, p. 830, lines 13-16 (= Mansi XI 684) (ἐπέχοντος τῆς τοποτηρησίας τοῦ αὐτοῦ τιμιωτάτου θρόνου Θεοδώρου τοῦ θεοφιλεστάτου πρεσβυτέρου). He made the monk Andreas 3 an anagnostes (παρὰ Θεοδώρου τοῦ τῆς ἁγίας πόλεως προέδρου) and then appointed him as his own secretary (ὑπογραφεύς); later he sent him to attend the Council of Constantinople at which the monothelete heresy was discussed: Epitome Vitae Andreae Hierosolymitani 2, Synaxarium, in PG 97, 1364. In Michael the Syrian II 452 the statement that the bishops at Constantinople "established another man in place of the bishop of Jerusalem" is a confused allusion to Georgios 16 and Theodoros 23. Cf. also Petros 17.

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