Theodosia 1 was the daughter of Arsaber 1: Theoph. Cont. I 21 (p. 35), Genesius I 18. Last wife of the emperor Leo V (Leo 15) and mother of his children; at Christmas 820 it was she who deterred him from executing Michael 10 on the grounds that it was wrong to do so during the festive season: Theoph. Cont. I 21 (p. 35), Leo Gramm. 210-211, Genesius I 18, Zon. XV 21. 7-9. Leo 15 was assassinated on Christmas Day and their children were tonsured and made to become monks on the island of Prote: Leo Gramm. 210-211 (unnamed). They had four sons, Symbatios Konstantinos 29, Basilios 54, Gregorios 70 and Theodosios 39; she was exiled with them to Prote: Theoph. Cont. II 1 (p. 41), Genesius I 21 (unnamed).

Theodosia 1 was exiled to the monastery of the Despotai together with Leo's mother (Anonyma 17): Theoph. Cont. II 7 (p. 46), Zon. XV 22. 2 (while her sons were sent to Prote). Addressee of a letter from Theodoros 15 (Theodore the Stoudite), together with her son Basilios 54 (addressed Θεοδοσίᾳ αὐγούστῃ καὶ Βασιλείῳ υἱῷ αὐτης); described as the daughter of a pious father; she and her son had been sent by the emperor (Michael 10) to live in a monastery on the island of Chalke - ἀπεδόθη ὑμῖν παρὰ τοῦ μεγάλου βασιλέως εἰς κατοικητήριον διαίτης ἡ νῆσος τῆς Χαλκίτου (and see Ioannes 453); she had made a confession of faith accepting the veneration of icons, conveyed to Theodoros 15 by Isaias 3 and (probably) Niketas 43, and Theodoros 15 sent her his congratulations; she is referred to as σε τὴν κυρίαν δέσποιναν: Theod. Stud. Ep. 538 (dated between 821 and 824, see Fatouros, pp. 477-478*; the unnamed hegoumenos of Medikion there mentioned is Niketas 43). She was related to Albeneka 1: Theod. Stud., Ep. 395, p. 550, lines 32-33. See also Barka 1.

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