Anonymus 506 was chartoularios of the basilikoi stabloi; owner of a seal dateable to the ninth century, possibly the first half; his name is lost, but may have included the letters ρα: Zacos and Veglery 2580 (IX) = Laurent, Corpus II, no. 926 (E/M IX). Obv.: cruciform monogram of Θεοτόκε βοήθει, with τω - .. - δου - .. in the corners. Rev.: ...ρα - ....αρτ' - ... στα - ..ων. The titles read: ...χαρτουλαρίῳ τῶν βασιλικῶν σταύλων.

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