Thomas 23 was a patrikios and komes of the basilikon Opsikion; owner of a seal dateable to the second half of the eighth century (see below): Schlumberger, Sig., p. 249, no. 3 (facsimile). Obv.: invocative monogram of Κύριε βοήθει with the legend [τῷ σῷ δ]ού[λῳ]. Rev.: Θομα - πατρικ(ίῳ) (καὶ) κο - μ(ιτι) του θεοφ - υλ(άκτου) β(ασιλικοῦ) Οψι - [κίο]υ. Schlumberger proposed to identify him with the rebel against Michael II, Thomas the Slav (Thomas 7) and dated the seal generally to the eighth or ninth century, but Shandrovskaia and Sokolova date the seal to the second half of the eighth century, while Seibt considered the seal too early for the owner to be Thomas 7; see Winkelmann, Rangstruktur, p. 75.

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