Anna 13 was the daughter of Sergios 100 and Euphemia 4, sister of Platon 1 and Theoktiste 3, aunt of Theodore the Stoudite (Theodoros 15), mother of Sergios 101 and of Theodote 1 (the second wife of the emperor Constantine VI, Konstantinos 8): Theod. Stud., Laudatio Platonis 3 (PG 99. 805B, 809B) (unnamed). She is mentioned and named by Theodoros 15 in a letter written to her son Sergios 101, probably in 809/811: Theod. Stud., Ep. 44, pp. 128-129 (Sergios is described as τὸ ἀγαθῆς ὄντως ῥίζης βλάστημα, Ἄννης ἐκείνης, τῆς ἐμοὶ μὲν σεβασμίας καὶ ἐρασμιωτάτης ὅτι μάλιστα, πᾶσι δὲ τοῖς γνωρίμοις ἐπαινουμένης διὰ σεμνότητα, τῆς ἐμῆς ὡς ἀληθῶς μακαρίας μητρὸς ἀμφοτέρωθεν: p. 129, lines 21-24). Cf. Anna 11.

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