Thomas 57 was a basilikos protospatharios and tourmarches of Thessalonike; owner of a seal dateable to the ninth century: Zacos and Veglery 2558. Obv.: cruciform monogram of Θεοτόκε βοήθει, with τω - σω - δου - λω in the corners. Rev.: +[Θ']μ[α] - β' α' σπαθ' - (καὶ) τουρμαρ' - Θεσσα'. The name and titles apparently read: Θωμᾷ βασιλικῷ πρωτοσπαθαρίῳ καὶ τουρμάρχῃ Θεσσαλονίκης. Zacos and Veglery note that, quite unusually, the first letter of the name, probably Θ, is followed on the seal by a mark of abbreviation.

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