Gregorios 158 was a spatharokandidatos; he was the addressee of three letters from Ignatius the Deacon (Ignatios 9), written when Ignatios 9 was bishop of Nikaia: Ignatius Diac., Ep. 1 (addressed Γρηγορίῳ σπαθαροκανδιδάτῳ), Epp. 2, 3 (τῷ αὐτῷ). The letters all concern an incident involving the supply of provisions by the Church (of Nikaia) to Gregorios 158 for distribution to the troops under his authority (εἰς τρὸφην τοῦ παρ' ὑμῶν κυβερνωμένου λαοῦ: Ep. 2, lines 21-22) and a complaint by some of the church's paroikoi that they had not been given their fair share of the church's produce; both the oikonomos of the church (Anonymus 746) and a kourator (Anonymus 747) were summoned before Gregorios 158 in connection with the affair (Ep. 2 and 3); Gregorios 158 is addressed as ἡ ὑμέτερα ὑπεροχή (Ep. 2, line 24) and ἡ περίβλεπτος ὑμῶν ὑπεροχή (Ep. 3, line 13); Mango suggested (Commentary, p. 163), that he may have held the post of protonotarios.

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