Theognostos 15 was a patrikios, basilikos protospatharios and logothetes of the dromos; owner of a seal dateable to the ninth century: Zacos and Veglery 2492A. Obv.: cruciform monogram of Θεοτόκε βοήθει, with [τω] - σ[ω] - δου - λω in the corners. Rev.: .... - νωστ[ω πατ] - ρικ' β' α' σπ.. - [(καὶ)] λογοθ' του - [δρ]ομ'. The name and titles read: Θεογνώστῳ πατρικίῳ, βασιλικῷ πρωτοσπαθαρίῳ καὶ λογοθέτῃ τοῦ δρόμου.

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