Dorotheos 9 was a Stoudite monk. He was the addressee of four letters from Theodoros 15 (Theodore the Stoudite): Theod. Stud., Ep. 124 (early summer 816), Ep. 188 (L 816/E 817), Ep. 239 (M/L 816) (all letters of encouragement to him during the persecution), Ep. 531 (c. 821/826) (all addressed Δωροθέῳ τέκνῳ). He is mentioned also in several other letters of Theodoros 15, all written during the persecution under Leo V (Leo 15): Theod. Stud., Epp. 110, 186, 187, 190, 195, 199, 217. In late 815 or early 816 he travelled with his fellow monk Silouanos 2 to visit first Theodoros 15 and then Naukratios 1: Theod. Stud., Ep. 110. Later, in late 816 or early 817 he was persecuted together with Bessarion 1 and Iakobos 14: Theod. Stud., Ep. 186, cf. 187, 189, 195, 199 (one of the ἀδελφοί who suffered beatings). He was one of the group of monks associated with Thaddaios 1: Theod. Stud., Epp. 186, 188, 190, 195, 199. During the persecution under Leo V (Leo 15) he was imprisoned separately from his fellow monks: Theod. Stud., Ep. 124, 239. He was subjected to beatings: Theod. Stud., Ep. 188, 239. He was apparently detained in a monastery (his gaoler is described as not a monk, still less a hegoumenos): Theod. Stud., Ep. 239. He was imprisoned not far from Kassia 2, who sent help to him (τῷ πνευματικῷ ἡμῶν τέκνῳ Δωροθέῳ ὄντι πεφυλακισμένῳ ὑπὲρ Χριστοῦ ἔγγιστά σου): Theod. Stud., Ep. 217 (to Kassia). He had perhaps suffered previously during the Moechian schism: Theod. Stud., Ep. 239. Between 821 and 826 he wrote to Theodoros 15 and received a reply with greetings from the archbishop (Ioseph 3) and was sent greetings to the monks with him and to Thekla 4: Theod. Stud., Ep. 531. He is addressed as τέκνον μου ἠγαπημένον or similar: Theod. Stud., Epp. 124, 188, 239, 531. In one letter of encouragement during the persecution he is addressed as ἀθλητὰ στερροκάρδιε, χρυσόσαρκε, σαπφείρου τιμιώτερε, πορφύρας ὡραιότερε and as σύμμορφε τοῦ Χριστοῦ: Theod. Stud., Ep. 188. He apparently held the priesthood (ὁ τῆς πρεσβυτερικῆς ἀκριβείας στύλος Δωρόθεος): Vita B Theod. Stud., 301C. He is named among the disciples of Theodoros 15 who survived the persecution under Leo V with distinction: Vita B Theod. Stud., 301C (τοὺς οἰκείους ... μαθητὰς, Vita C Theod. Stud. 57, p. 291 (Δωρόθεον τὸν ἰσάγγελον), Vita A Theod. Stud., 205C (τῶν μαθητῶν ἔνιοι χρόνιοι). He was the spiritual father of the monk Gregorios 139: Theod. Stud., Catech. Parva 133 (p. 466 Auvray) (styled ἀββᾶς Δωρόθεος).

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