Petros 126 was a monk; he was the author of a Life of St Ioannikios (Ioannikios 2): Petrus, Vita Ioannicii, title (Βίος ... συγγραφεὶς παρὰ Πέτρου μοναχοῦ). The work is published in the Acta Sanctorum, Novembris II i, 384-435 (BHG 936). Petros 126 was asked to undertake the work by Eustratios 19, a life-long follower of Ioannikios 2, who was also a major source of his information: Petrus, Vita Ioannicii 12. He tells how he himself visited Ioannikios 2, accompanied by a fellow monk, Platon 22 (τὸν σὺν ἐμοὶ ἐφησυχάζοντα ἀδελφὸν Πλάτωνα); the following year he again visited him accompanied this time by Petros 127 and Ioannes 441, but not by Platon 22 who, as foretold the previous year by Ioannikios 2, was unable to make the journey; Ioannikios 2 gave Petros 126 gifts (εὐλογίαι) for his mother and his five sisters, as well as for Platon 22 and for many others, amounting to gifts for thirty-six persons in all: Petrus, Vita Ioannicii 68, cf. Sabas, Vita Ioannicii 43 (telling the same story; Petros 126 is described as a μοναχὸς εὐλαβὴς καὶ ἐνάρετος, who used to visit Ioannikios 2 regularly with Platon 22; Sabas 1 also alludes to him as ὁ ἀββᾶς Πέτρος). Ioannikios 2 died in 846 and the Life by Petros 126 was apparently composed not long afterwards. Since Eustratios 19 was the hegoumenos of the monastery of the Agauroi, it is probable that Petros 126 was a monk in the same monastery.

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