Anatolios 3 was a Stoudite monk, the addressee of three letters from Theodore the Stoudite (Theodoros 15), two of them jointly with Sabbatios 1: Theod. Stud., Ep. 81 (spring 816; addressed Ἀνατολίῳ καὶ Σαββατίῳ τέκνοις), Ep. 164 (815/818; addressed Ἀνατολίῳ τέκνῳ, but the contents show that it was sent also to Sabbatios 1), Ep. 311 (March/April 818; addressed Ἀνατολίῳ τέκνῳ). He is also mentioned in two letters of Theodoros 15, both addressed to Naukratios 1: Theod. Stud., Ep. 384 (a. 818), Ep. 411 (not before 819). A disciple and secretary of Theodoros 15 (Ἀνατολίῳ τῷ κρατίστῳ φοιτητῇ καὶ νοταρίῳ τοῦ μεγάλου γεγονότι πατρός), he was with Sophronios 1 in Paphlagonia once during the iconoclast persecution when they witnessed a miraculous shower of rain: Vita B Theod. Stud. 309C-312A. He and Sabbatios 1 were together and wrote several letters to Theodoros 15 when Theodoros 15 was in exile at Metope and then Boneta; they are addressed by him as ἐπιπόθητά μου τέκνα καὶ λίαν ἠγαπημένα or similar: Theod. Stud., Ep. 81, 164. In March/April 818 Theodoros 15 feared that he had defected to the iconoclast cause as he had not heard from him for a long time, but was reassured after receiving a letter; he is addressed as ὦ ἱερὸν τέκνον: Theod. Stud., Ep. 311. However in a letter to Naukratios 1 later in the year Theodoros 15 laments that Anatolios 3 has defected: Theod. Stud., Ep. 384. He soon repented but had to undergo a two year penance (πληρουμένης τῆς διετίας μετεχέτω τῶν ἁγιασμάτων): Theod. Stud., Ep. 411.

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