Sergios 77 was probably bishop of Gangra; owner of a seal dateable to the late seventh century or the early eighth: Zacos and Veglery 1310. Obv.: a saint, standing, with nimbus, chiton and leggings, holding in his right hand a long cross, in his left a book of the Gospels; to his left a church with gable roof surmounted by a cross; to his right a cylindrical building with flames rising from the flat roof and a stream flowing out of the door at ground level; all surrounded by a wreath. Rev.: cruciform monogram of Θεοτόκε βοήθει, surrounded by a circular inscription reading: +Σεργιω........; the remaining text is lost. The iconography closely resembles that on the seal of Ioannes 182, bishop of Gangra in the eighth century (see Zacos and Veglery, note to 1310; similar scene, different execution; the saint is identifiable as St Hypatios) and Sergios 77 therefore probably held the same position. If so, given the dating of the seal, he may have been identical with Sergios 13 (attested in 692).

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