Theodoros 66 was also called Krithinos (probably his family name; cf. Winkelmann, Quellenstudien, p. 166); he was an archbishop (in Sicily) (Θεόδωρον δὲ ἀρχιεπίσκοπον τὸν λεγόμενον Κρίθινον or similar); at the time when Alexios 2 was absent in Sicily and was being accused of treason, Theodoros 66 was in Constantinople; the emperor Theophilos 5 summoned him and sent him to Sicily to bring Alexios 2 back, giving him a written guarantee (τὸ ἴδιον φυλακτόν; ἐνυπόγραφον λόγον) of Alexios 2's safety; Theodoros 66 persuaded Alexios 2 that it was safe to return and escorted him back; when Alexios 2 was then maltreated and imprisoned, Theodoros 66 waited for Theophilos 5 in the church at Blachernai and loudly rebuked him from the altar, in the presence of members of the senate, for breaking his word; Theodoros 66 was dragged from the altar, beaten and sent into exile, partly, it is said, for rebuking the emperor, partly because he held iconophile views in opposition to those of the emperor; shortly afterwards, following protests from the patriarch, he was recalled and given a pardon and was then appointed to the position of oikonomos of Hagia Sophia (οἰκονόμον τῆς μεγάλης ἐκκλησίας), supposedly because his sufferings had made him unfit to be bishop: Leo Gramm. 217-218, Georg. Mon. Cont. 795-796, Ps.-Symeon 630-631. The veracity of this story is rightly doubted by J. Gouillard, Deux Figures mal connues du second iconoclasme, in La Vie religieuse Byzance (Variorum, 1981), pp. 394ff. In a passage which appears to be an interpolation in the proceedings of the seventh session of the Second Council of Nikaia (the Seventh Ecumenical Council) on 13 October 787, in which notable iconoclasts are anathematised, Theodoros 66 Krithinos and two fellow heretics Antonios and Ioannes are included; they are described as following the lead of the heresiarchs of iconoclasm, Ioannes 140 and Konstantinos 73: Mansi XIII 400 (προσέτι τοῖς ζηλώσασι καὶ μιμησαμένοις τὴν τριφυῆ κακίαν τῶν εἰρημένων ἁιρεσιάρχων προέδρων ἀνάθεμα. Θεοδώρῳ, Ἀντωνίῳ καὶ Ἰωάννῃ, ὡς Μανέντι, Ἀπολλιναρίῳ καὶ Εὐτυχεῖ τοῖς φαντασιοσκόποις καὶ δοκηταῖς ἀνάθεμα. Θεοδώρῳ τῷ Συρακουσῶν τῆς Σικελίας τῷ ἐπιλεγομένῳ Κριθίνῳ, καὶ τοῖς συναποστατοῦσιν αὐτῷ ἀνάθεμα). This person can hardly be other than the individual from the reign of Theophilos 5, and his presence suggests that the passage, which occurs in the Greek text but not in the Latin version (at Mansi XIII 399), is a later interpolation, possibly a marginal note which found its way into the main text. Antonios and Ioannes are the two patriarchs of Constantinople, Antonios I and Ioannes VII (see Antonios 3 and Ioannes 5).

The date of the anathemata may have been 843, on the occasion of the Triumph of Orthodoxy. The passage was presumably absent from the Greek text which was translated into Latin late in the ninth century by Anastasius Bibliothecarius (unless it was identified by him as an addition and omitted?). Theodoros, known as Krithinos, was an iconoclast and is named fourth after the iconoclast patriarchs in the list of people anathematised as iconoclasts in the Synodikon of Orthodoxy; the others named are Paulos 93, Theodoros 350, Stephanos 152 and Laloudios 1 Leo: Gouillard, "Synodikon", p. 57, lines 175-179 (ἔτι δὲ καὶ Θεοδώρῳ τῷ Κριθίνῳ).

This man was perhaps identical with Theodoros, archbishop of Sicily, the owner of a seal, dateable to the ninth century: Laurent, Corpus V 1, no. 886 = Gray Birch, BMSeals, p. 72, no. 17844. Obv.: invocative monogram of Θεοτόκε βοήθει with the legend τω - σω - δου - λω. Rev.: [+] [τῷ σῷ] - δούλῳ [Θεο] - [δ]όρῳ ἀρχιε - [πισκό]πῳ - [Σι]κελί(ας). In a note on pp. 695-696 Laurent discusses the evidence for bishops of Syracuse in the ninth century called Theodoros and identifies the owner of this seal with Theodoros Krithinos rather than with the later partisan of Ignatios, Theodoros 351 (cf. also Grumel, Regestes, n. 445) because of the absence of an image from the seal.

Possibly identical with Theodoros 328 (deacon and oikonomos of the Great Church in 824).

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