Nikephoros 66 was the hegoumenos of an unnamed monastery and was the addressee of a letter from Theodoros 15 (Theodore the Stoudite) written in 796 (cf. Anonymus 718); he is addressed as ἀνεψιέ and as τιμιώτατε, and was therefore a relation, probably a cousin rather than a nephew, of Theodoros 15 as he was probably the older man (cf. line 37 ταῦτα ὡς πατρὶ καὶ φιλουμένῳ τεθάρρηκα φανερῶσαί σοι); early in the Moechian dispute he had tried to mediate between Theodoros 15 and the emperor Constantine VI (Konstantinos 8): Theod. Stud., Ep. 4 (addressed Νικηφόρῳ ἡγουμένῳ). In view of the circumstances, Nikephoros 66 was probably the hegoumenos of a monastery in Constantinople.

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