basilios 129 was hegoumenos of an unnamed monastery (possibly in Constantinople), he was the addressee of three letters from Theodoros 15 (Theodore the Stoudite): Theod. Stud., Ep. 60 (a. 821/826), Ep. 494 (a. 824/826), Ep. 495 (a. 824/826) (all addressed Βασιλείῳ ἡγουμένῳ or τῷ αὐτῷ). He was a friend of Petros 129; during the persecution under Leo V (Leo 15) he had denied the icon of Christ and signed a document banning the veneration of icons; later, under Michael II (Michael 10), he wrote to Theodoros 15 expressing his repentance; Theodoros 15 replied fixing the terms of his penance and sending Eusebios 4 and two monks to his monastery with further details; he also forbade him to see Antonios 29; he is styled ἡ τιμιότης σου and addressed as ἀδελφέ: Theod. Stud., Ep. 60. Later (probably in or after 824) Theodoros 15 wrote to him in Constantinople where Basilios 129 was still in charge of his monastery, at a time when Theodoros 15 was forbidden to live there, and apparently he was on good terms with the emperor (κύριοί ἐστε καὶ δεσπόται καὶ καθηγούμενοι τῶν ἰδίων μονῶμ καὶ βουλευμάτων); he is styled ἡ ἀδελφική σου τιμιότης: Theod. Stud., Ep. 494.

Basilios 129 replied to this letter promising to leave his monastery and Theodoros 15 wrote again to him approving his action (ὑποχωρεῖτε τῆς ἡγουμενικῆς διακρατήσεως) and urging him to carry out his promise (ὑποχώρησον τῆς κατοχῆς τοῦ μοναστηρίου, καθῶς καὶ ὑπέσχου); Basilios 129 is addressed as ὦ φιλότης and ἀδελφὲ ἠγαπημένε; Theodoros 15 sent him greetings from Ioseph 3 and the other brothers: Theod. Stud., Ep. 495.

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