Konstantinos 76 was deacon and chartophylax of the Great Church (Hagia Sophia) at Constantinople; author of a work about the Martyrs from which extracts were read at the Second Council of Nikaia (the Seventh Ecumenical Council) (Κωνσταντίνου διακόνου καὶ χαρτοφύλακος τῆς ἁγιωτάτης τοῦ Θεοῦ μεγάλης ἐκκλησίας Κωνσταντινουπόλεως εἰς πάντας τοὺς ἁγίους μάρτυρας); the copy was in the patriarchal library at Constantinople where it had been vandalised by the iconoclasts who had cut out pages of text referring to icons but had left untouched the silver covers with images of saints on them: Mansi XIII 184-185 (extracts on 185-188). See Demetrios 3 and Leontios 9. His date is not certain. Possibly seventh century; see Beck, Kirche, p. 399 and n. 3. His work is extant and is published in PG 88. 480-528.

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