Euthymios 16 was hegoumenos of an unnamed monastery in Thessalonike, mentioned in a letter of Theodoros 15 (Theodore the Stoudite), written in 810/811: Theod. Stud., Ep. 51, pp. 151-153 (οὐ τῶν ἀγελαίων τινά, ἀλλὰ μονάζοντα, καὶ τοῦτον ἡγούμενον καὶ μάλα τὸν εὐλαβέστατον, τοὔνομα Εὐθύμιον, τὸν τῆς εὐθυμίας ὄντως φερώνυμον: p. 152, lines 20-22). He is certainly to be identified with the unnamed hegoumenos at Thessalonike mentioned in another letter of Theodoros of the same date: Theod. Stud., Ep. 48, pp. 129-139 (ἕτερός τε ἡγούμενος ἀμέτρως μαστιγωθεὶς τῶν ἐκεῖσε: p. 130, line 42). He declared himself a supporter of the deposed archbishop of Thessalonike, Ioseph 3, in 809/810, by refusing to recognise the man appointed as his successor (Anonymus 670) and was as a result arrested and flogged by the new archbishop: Theod. Stud., Epp. 48, pp. 129-139; 51, pp. 151-153. He presumably therefore held the same views about the Moechian schism as Ioseph 3 and Theodoros 15.

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