Theophylaktos 111 was a priest; he was the addressee of a letter from Theodoros 15 (Theodore the Stoudite) written in c. 817; he had put his signature to an iconoclast document, for which he was blamed by Theodoros; however he had subsequently repented and had performed the burial service for the Stoudite monk Thaddaios 1 who died after enduring beatings during the persecution; Theodoros 15 judged that Theophylaktos 111 was absolved from his guilt but nevertheless forbade him from celebrating mass until the final Triumph of Orthodoxy: Theod. Stud., Ep. 251 (addressed Θεοφυλάκτῳ πρεσβυτέρῳ).

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