Karterios 1 was a Stoudite monk; he was the addressee of a letter, jointly with his fellow monks Agapios 3 and Aphthonios 1, from Theodore the Stoudite (Theodoros 15), in late 818 or early 819; addressed as a trio of brothers (τριὰς ἀδελφική: p. 557, line 3), they were praised by Theodoros 15 after being punished for disobeying the iconoclast hegoumenos Leontios 29, to whom they were subject; Karterios 1 is punningly described by Theodoros 15 as truly stout-hearted (σὺ ὁ φερωνύμως καρτερόψυχός μου Καρτέριος: p. 558, line 22): Theod. Stud., Ep. 402, pp. 557-558 (addressed Τοῖς εἰς τὰ Στουδίου ἀδελφοῖς). The same three men are alluded to in a later letter (Κατήχησις: p. 570, line 1) from Theodoros 15, written in May or June 819, after Leontios 29 had repented of his iconoclast stance: Theod. Stud., Ep. 410, pp. 570-572 (περὶ ὑμῶν τῶν τριῶν ὅτι ἡνώθητε ὑπὸ μεταμελείας τοῦ ἐλεεινοῦ Λεοντίου: p. 572, lines 62-63).

According to a sermon of Theodoros 15, Theod. Stud., Catech. Parva 96 (p. 329 Auvray), Karterios 1 left to join another community of religious. The sermon was written while Theodoros 15 was in exile but when precisely is not certain and so the date and circumstances of Karterios 1's departure are unknown. He may have returned to the Stoudite monastery under Leontios 29 from exile between 815 and 818, but perhaps more probably (since he went to another synodia) he left the Stoudites altogether in or after 819, for some unrecorded reason.

(Publishable link for this person: )