Basilios 135 was hegoumenos and archimandrite at Rome, he was the addressee of two letters from Theodoros 15 (Theodore the Stoudite), one in 809 and one in 818: Theod. Stud., Ep. 35 (E/M 809; addressed Βασιλείῳ τῷ εὐλαβεστάτῳ ἡγουμένῳ καὶ ἀρχιμανδρίτῃ Ῥώμης), Ep. 273 (E/M 818; addressed Βασιλείῳ ἀρχιμανδρίτῃ Ῥώμης). His monastery was probably that of St Sabas at Rome; see Fatouros, p. 178*. In 809 he was in Rome; Theodoros 15 and Platon 1 learned via Epiphanios 48 that Basilios 135 had not been able to write to them, and so they sent Epiphanios 48 back to report to him the details of their sufferings in the Moechian controversy and to request the help and prayers of himself and the bishop of Rome; Basilios 135 and the pope were asked to condemn the recent Moechian synod; Basilios 135 and the bishop of Rome are described as ἁγιώτατοι ἡμῶν καὶ ποθητοὶ καὶ ἀεισέβαστοι πατέρες: Theod. Stud., Ep. 35.

In a subsequent letter to the bishop of Rome, Leo 11 (pope Leo III), Theodoros 15 mentions that he had previously sent information about the Moechian affair via the unnamed archimandrite (διὰ μέσου τοῦ εὐλαβεστάτου ἀρχιμανδρίτου) and Epiphanios 48: Theod. Stud., Ep. 33.

In 818 Basilios 135 received a letter from Theodoros 15 seeking his support during the persecution under Leo V (Leo 15); Basilios 135 is described as an old friend and acquaintance of Theodoros 15, a father, champion, sympathiser, colleague, helper and adviser; he held a high position and was a leading light in the church at Rome (προύχων τῷ ἀξιώματι ἐν τῇ πρωτίστῃ τῶν ἐκκλησιῶν τοῦ Θεοῦ διαλάμπεις); Theodoros 15 had written earlier via Dionysios 6 and Euphemianos 4 and had not received a reply but had had news from Rome from the bishop of Monembasia (Ioannes 458) and from the hegoumenos Methodios 1; Basilios 135 is described as ὁ τοῦ Θεοῦ ἄνθρωπος καὶ ἀξιάγαστος πατήρ and referred to as τῷ ἐμῷ ἠγαπημένῳ καὶ ἁγίῳ πατρί: Theod. Stud., Ep. 273.

In another letter to Rome, to Epiphanios 48, Theodoros 15 asks for greetings to be given to all the ἅγιοι, especially to his close acquaintances, including τὸν ἅγιόν μου πατέρα τὸν ἀρχιμανδρίτην: Theod. Stud., Ep. 377.

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