Sergios 52 was one of the twelve monks (ἀδελφοί) whom Stephanos 2 (Stephen the Younger) received under him when he founded the monastery on Mt Auxentius; Sergios 52 and Stephanos 79 are described as a pair who were bitten by Satan and left the service of God to become slaves of the tyrant (i.e. the emperor Constantine V (Konstantinos 7)) (καὶ τὴν λαθρόδηκτον τοῦ Σατᾶν ξυνωρίδα - Σέργιόν τέ φημι καὶ Στέφανον, τοὺς ἐκ θεοῦ ὑπὸ τοῦ τυράννου ἐξανδραποδισθέντας): Vita Steph. Iun. 110, 19-28 (1097D-1100A). The monastery was founded around the middle of the eighth century. Sergios 52 was suborned by Kallistos 8 and accepted a gold solidus, with the promise of another one later, to turn against Stephanos 2; he drew up a set of charges, in cooperation with Aulikalamos 1, accusing Stephanos 2 of speaking against the emperor and of misconduct with the nun Anna 6: Vita Steph. Iun. 131, 21-132, 6 (1125C-D). They sent this to Konstantinos 7, then on campaign against the Bulgars: Vita Steph. Iun. 132, 13-15 (1128A), cf. 147, 22-25 (1148A-B) (he and Stephanos 79, alone of Stephanos 2's monks, failed to join him in exile on Prokonnesos, probably in 762; after sending the list of charges to the emperor, Sergios 52 had abandoned the monastic dress).

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