Eustratios 9 was a protonotarios; owner of a seal dateable to the eighth or ninth century: Schlumberger, Sig., p. 552, no. 6 (no facsimile). Obv.: invocative monogram of Θεοτόκε βοήθει with the legend τῷ σῷ δούλῳ. Rev.: [+Εὐστ]ρατη[ῳ (πρωτο)]νοταρίῳ ἀμήν.

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