Klemens 1 was a Stoudite monk, mentioned in two letters of Theodore the Stoudite (Theodoros 15), written in 817 or 818; during the persecution under Leo V (Leo 15) he, together with Leontios 29 and Maximos 2, had yielded to pressure from the iconoclasts and lapsed; they were nevertheless to be regarded, according to Theodoros 15, as his disciples (τέκνα καὶ μέλη): Theod. Stud., Ep. 302 (a. 818), cf. Ep. 326 (a. 817/818; Leontios 29 and two other monks had lapsed). Klemens 1 subsequently returned and made his complete peace with Theodoros 15, who sent him in 821 with a letter addressed to Laurentios 4 and several other monks scattered because of the recent persecution; he was now a hegoumenos and had fully accepted the orthodox view (ὁ γραμματηφόρος, ὁ ἀγαπητὸς ἡμῶν υἱὸς Κλέμης, ὁ εὐλαβέστατος ἡγούμενος, πάντα ἀσμένως εἰσδεξάμενος, ἃ ἔδει αὐτῷ λαληθῆναι, καὶ περὶ πάντων ποιησάμενος τὴν προσήκουσαν ὑπολογίαν); Theodoros 15 asked his addressees to greet Klemens 1 as one of themselves: Theod. Stud., Ep. 433. Later, between 821 and April 824, Klemens 1, a hegoumenos, reported to Theodoros 15 that the actions of the empress Theodosia 1 and her son Basilios 54 in expelling a hegoumenos and his monks from their monastery so that they could live there themselves was the result of an imperial command and not their own choice (διὰ τοῦ πνευματικοῦ ἡμῶν υἱοῦ Κλήμεντος, τοῦ εὐλαβεστάτου ἡγουμένου): Theod. Stud., Ep. 538.

He is to be identified with Klemens, the secretary of Theodore the Stoudite (Theodoros 15) (Κλέμης, νοτάριος αὐτοῦ), who was with Theodoros 15, Ioannes 439, Petros 49 and other bishops and hegoumenoi who met Ioannikios 2 at the metochion of St Elias (possibly in 821; see Ioannikios 2 and Theodoros 15): Sabas, Vita Ioannicii 28. In the account of this event in the other Life of Ioannikios 2 by Petros 126, Klemens 1 is numbered among the hegoumenoi: Petrus, Vita Ioannicii 36 (ἐκ δὲ τῶν ἡγουμένων Κλήμης ὁ ἱερώτατος). The two sources are clearly referring to the same person. See also the reference at Vita Anton. Iun. (BHG 142) 1. Probably identical with the hegoumenos and iconophile who, under Theophilos 5, lived in exile in Bithynia with the bishop of Plousias, Paulos 27: Vita Petr. Atr. 68, p. 197 (σὺν Κλήμεντί τινι ὁσιωτάτῳ ποιμένι φιλοθέῳ καὶ φιλολόγῳ). For the dates, see Paulos 27. See further Laurent, La Vie merveilleuse, p. 196, n. 4 (citing Theod. Stud., Ep. 433). On ποιμὴν, see Laurent, op. cit., p. 118, n. 2.

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