Theosostos 2 was the hegoumenos of an unnamed monastery at Thessalonike in c. 809, when he was expelled from his monastery and the city for his refusal to communicate with the new archbishop appointed in place of Ioseph 3 (exiled for his stance in the Moechian controversy); he is mentioned in three letters written then by Theodoros 15 (Theodore the Stoudite): Theod. Stud., Ep. 43 (γίνωσκε ἐνσταθέντα τὸν Θεόσωστον τοῦ μὴ κοινωνῆσαι αὐτὸν ἐκ τοῦ ἀνιέρως ἀνελθόντος εἰς τὸν θρόνον σου, καὶ ἐκδιωχθέντα νεανικῶς ἐκ τοῦ μοναστηρίου αὐτοῦ), 48 (Θεόσωστός τε ὁ ἡγούμενος διωκόμενος σὺν τοῖς φοιτηταῖς ἐκ τῆς αὐτῆς πόλεως), 51 (τοῦ ἀνδρικωτάτου μου Θεοσώστου τῆς τε αὐτοῦ δυοπεντεκαιδεκάδος θεοσθενοῦς συνοδίας). He was the addressee of a letter, no longer extant, from Theodoros 15, mentioned in Theod. Stud., Ep. 562.

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