Euprepianos 1 was a Stoudite monk, addressee of three letters from Theodoros 15 (Theodore the Stoudite), written between 809 and 818: Theod. Stud., Epp. 36, pp. 101-106 (c. 809) (addressed Εὐπρεπιανῷ καὶ τοῖς σὺν αὐτῷ); 41, pp. 121-122 (c. 809/811) (addressed Σιλουανῷ καὶ Εὐπρεπιανῷ τέκνοις); 329, pp. 469-471 (c. 818) (addressed Εὐπρεπιανῷ τέκνῳ). He is also mentioned in seven other letters of Theodoros 15, written between 809 and 818, and in sermons of Theodoros: Theod. Stud., Epp. 38, pp. 108-111 (c. 809); 40, pp. 115-120 (c. 809/811); 133, pp. 250-251 (spring 816); 136, p. 253 (spring/summer 816); 178, pp. 300-301 (M/L 816); 358, pp. 491-493 (c. 818); 556, pp. 853-854 (c. 810/811); Theod. Stud., Catech. Parva 9 (pp. 31-33 Auvray), cf. Catech. Parva 95 (p. 326 Auvray) (unnamed). He is styled τὸν ἀδελφὸν Εὐπρεπιανόν, Theod. Stud., Ep. 38, p. 109, line 22; and ὃν καλὸς Εὐπρεπιανός, Theod. Stud., Ep. 40, p. 115, line 25. In 809 Theodoros 15 wrote to him and others about the Moechian schism: Theod. Stud., Ep. 36, pp. 101-106. He and Silouanos 2 were informed by Theodoros 15 of the secret code by which Theodoros 15 proposed to refer to individual Stoudite monks suffering during the dispute over the Moechian affair: Theod. Stud., Ep. 41, pp. 121-122. During the persecution under Leo V (Leo 15) he was imprisoned for his support for the veneration of icons and twice received a flogging: Theod. Stud., Ep. 133, p. 250, line 12 (twice flogged), 178, p. 301, line 37 (imprisoned) (for the dates, see above). In 818 he had abandoned the life of a monk and was employed as a worker in a monastery for women: Theod. Stud., Ep. 329, pp. 469-471. For this he was at first rebuked by Theodoros but was later forgiven: Theod. Stud., Ep. 358, pp. 491-493. Described as a former monk who had become the oikonomos of the Sakkoudion monastery (οὐκ εἰς οἰκονόμου προὴχθη βαθμὸν ἐν τῷ Σακκουδίωνι;); he had once suffered imprisonment like Theodoros 15 as a confessor and had recently undergone beatings and maltreatment, but had subsequently abused his position as oikonomos to embezzle money and had abandoned his vows; news of his death, in the arms of a woman (συμπλακεὶς τῇ Εὔᾳ), had recently reached Theodoros 15; he had fallen gravely ill, allegedly of leprosy and worse: Theod. Stud., Catech. Parva 9, cf. Catech. Parva 95 (unnamed oikonomos).

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