Basilios 128 was a monk; he was the addressee of a letter from Theodoros 15 (Theodore the Stoudite) written between mid 816 and late 818; Basilios 128 was apparently a native of the West (ὁ ἀπὸ δύσεως ἡμῖν ἀνατείλας ἀστὴρ τῆς εὐσεβείας); Basilios 128 was an iconophile and a victim of the persecution under Leo V (Leo 15); Theodoros 15 greeted him as ὁμογνώμων and addressed him as πατέρα εἴτουν ἀδελφόν (Basilios 128 was therefore probably older than Theodoros 15); Basilios 128 is styled ἡ ἁγιωσύνη σου: Theod. Stud., Ep. 361 (addressed Βασιλείῳ μονάζοντι). Cf. also Basilios 118 (possibly the same person).

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