Thomas 14 was bishop of Klaudiopolis (in Honorias): Mansi XIII 108 (Θωμᾶν ἐπίσκοπον Κλαυδιουπόλεως). He was the addressee of a letter from the patriarch Germanos I (Germanos 8; 715-730); he was supposedly doubtful about the traditional veneration shown to icons, and Germanos 8 wrote a long letter defending the practice: Mansi XIII 108-128 (read out at the Second Council of Nikaia (the Seventh Ecumenical Council) among letters from Germanos 8 concerning the start of the iconoclast controversy). The date was probably late in the patriarchate of Germanos 8, when iconoclasm was becoming a problem (c. 726/730).

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