Antonios 25 was an iconoclast, responsible for persecuting iconophiles, among them a number of Stoudite monks, in the reign of Leo V (Leo 15). He is mentioned in three letters of Theodore the Stoudite (Theodoros 15): Theod. Stud., Ep. 120, pp. 238-239 (to Naukratios 1, in winter 815/816, see Fatouros, p. 237*); the noble brothers (τοὺς γενναίους ἀδελφοὺς, p. 238, line 3) earned the martyrs' crown through their deeds against the impious Antony (τὰ κατὰ τὸν ἀσεβῆ Ἀντώνιον, p. 238, line 4); Ep. 181, pp. 303-305 (to Euthymios 15 and nine other monks who had suffered punishment and exile, in 816, see Fatouros, p. 267*) ἀθλοφορικὴ ἡ πρὸς τὸν χριστομάχον Ἀντώνιον ὑπόκρισις ὑμῶν, p. 304, line 13; Ep. 246, pp. 378-379 (to Euthymios 15, in mid or late 816, who is praised for anathematising Antonios the destroyer of icons and suffering a beating with his nine monastic colleagues - ἀναθεματίσαι τὸν ἀλιτήριον Ἀντώνιον, καθελόντα τὰς σεπτὰς εἰκόνας, p. 378, lines 12-13). There is no evidence to show whether he was a cleric or a layman.

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