Ignatios 6 was metropolitan bishop of Nikomedeia; in 844 he and the patriarch of Constantinople Methodios 1 summoned the head of the monastery of St Zacharias at Atroa, Paulos 26, to present himself at Constantinople to be ordained as bishop: Vita Petr. Atr. 103 (Vita Petr. Atr. Retractata, pp. 153-155) (the date was July and August 844). Metropolitan bishop of Nikomedeia; he was the addressee of a letter from Ignatius the Deacon (Ignatios 9), in support of a monk from the same monastery as Ignatios 9 who was eager to obtain a bishopric (Anonymus 753); he is addressed as ὦ ἱερώτατε πάτερ; Ignatios 9 alludes to τῆς ἀλαθήτου ὑμῶν καὶ διορατικῆς ... τελειότητος and τὴν ἱερὰν ὑμῶν ... πατρότητα: Ignatius Diac., Ep. 49 (addressed Ἰγνατίῳ μητροπολίτῃ Νικομηδείας). On his dates and identity, see Mango, Ignatios, p. 158. Ignatios 9's letter was written between 843 and 846.

He is perhaps to be identified with the unnamed and apparently expelled bishop of Nikomedeia included in a list of persons who were exiled as false accusers, whom St Ioannikios (Ioannikios 2) advised the patriarch Methodios 1, during a meeting in 846, to avoid completely (cf. also Athanasios 8, Naukratios 1, Ioannes 240 and Anonymus 565): Petrus, Vita Ioannicii 70 (καὶ τῆς Νικομηδείας ἐπισκοπῆς ἐκπεπτωκότος τοῦ μονομάχου ἤτοι θεομάχου; the significance of the epithets is unclear; μονομάχος is taken to be a personal name by Mango, Ignatios, p. 158). He was apparently regarded as an associate of the Stoudite monks, who were to blame for divisions in the Church during the patriarchate of Methodios 1 and for making false accusations against him. A recent bishop of Nikomedeia, Theophylaktos 37, had spent many years expelled from his see, as an iconophile, but he appears to have died in 845, without ever returning to Nikomedeia. Possibly Ignatios 6 was one of the false accusers exiled and perhaps anathematised, apparently in 845 or 846.

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