Ioannes 133 was a monk of the monastery of Bonisoi; in 787 he attended the Second Council of Nikaia (the Seventh Ecumenical Council) as representative of the hegoumenos of the monastery of Bonisoi, Stephanos 47, and is attested at the fourth session, on 1 October 787, when he subscribed the statements read out from the Fathers in support of the veneration of icons: Mansi XIII 156 (Ἰωάννης μοναχὸς καὶ ἐκ προσώπου Στεφάνου ἡγουμένου Βονίσων; the Latin version, at XIII 155, calls him "Ioannes monachus et ex persona Stephani hegumeni Bonisensium"). He probably attended other sessions of the Council also; see Gregorios 45. Cf. also Kallistos 5.

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