Mentioned in the inscription from May 1270 on the bronze bell found near the Church of Saint Nicholas in Melnik. He was a priestmonk. He was the donor of the bronze bell dedicated to the archangel Michael (Κύριε βοήθει τόν δούλον σοῦ Θεοδόσιον ἱ[ε]ρομόναχον Τ[...?]Α κενίσαντα ταύτην ἐπὶ βασιλείας Μηχαήλ τοῦ Παλαιολόγου καὶ νεοῦ Κονσταντίνου κωδον τοῦ <ἀρχιστρατηγοῦ Μηχαλ τοῦ ἐν τῷ Μελενίκῷ· μην(p) μαρτίο Ἰνδικτίονος Ι Γ Ἔτους ΣΨΟΗ).