Theodoros 251 was the owner of a seal dateable between the mid seventh century and the mid eighth: Zacos and Veglery 1637. Obv.: cruciform monogram of Θεοτόκε βοήθει, placed inside a four-lobed envelope. Rev.: cruciform monogram of Θεοδώρου ...., placed inside a four-lobed envelope. The full interpretation of the monogram on the reverse is uncertain.

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