Sergios 105 is mentioned in a letter written by Theodoros 15 (Theodore the Stoudite) in 826 to Ioseph 20 (hegoumenos of the monastery ton Kerameon, τῶν Κεραμέων); he had delivered to Theodoros 15 a letter from Ioseph 20; he was perhaps a monk: πρὸ τῆς ἐλεύσεως τοῦ καλοῦ Σεργίου: p. 821, line 2): Theod. Stud., Ep. 544, pp. 821-823.

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