A monk, Euthymios 14 was the younger brother of Theodoros 15 (Theodore the Stoudite) and Ioseph 3, and elder brother of Anonyma 74; with his mother (Theoktiste 3), brothers and sister and other relatives, he yielded to the persuasion of his uncle Platon 1 and sold off the family property in Constantinople before withdrawing to the monastery of Sakkoudion (in Bithynia) to pursue the monastic life: Vita B Theod. Stud. 241A (τοὺς γὰρ ἑαυτοῦ δύο συναίμονας μετὰ τῆς μιᾶς ἀδελφῆς αὐτῶν), Vita C Theod. Stud. §8, p. 262 (σὺν ἅμα δυσὶ τοῦ Θεοδώρου ἀδελφοῖς καὶ μικρᾷ ἀδελφῇ), Vita A Theod. Stud. 121A (ἀδελφοὺς, Ἰωσὴφ καὶ Εὐθύμιον, σὺν ἅμα καὶ μικρᾷ ἀδελφῇ). He supported the opposition to the second marriage of the emperor Constantine VI (Konstantinos 8) and suffered beatings in consequence; he received encouragement in a letter of Theodoros 15 to Platon 1, written in March or April 797: Theod. Stud., Ep. 1, pp. 5-8 (Ἀνδρίζου οὖν καὶ αὐτός, ἀδελφὲ κῦρι Εὐθύμιε. καλὸν ἀγῶνα ἠγωνίσω: p. 7, lines 63-64). Theodoros refers to him as τὸν γλυκύν μου κύριον Εὐθύμιον (p. 21, line 10) in a letter to their mother, Theoktiste 3; he was by then already dead (cf. p. 22, lines 24-25: God had first taken his sister and then his brother): Theod. Stud., Ep. 6, pp. 21-23 (c. 797/799).

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