Ignatios 20 was bishop of Lophoi (in Bithynia); he was the addressee of two letters from the patriarch Photius (Photios 1), both probably written between May 866 and September 867: Photius, Epp. 23, 70 (I 74, 113ff. Laourdas-Westerink) (both addressed Ἰγνατίῳ ἐπισκόπῳ Λόφων). He had been consecrated as bishop by Photios 1, but now Photios 1 regretted that he had done so and threatened to excommunicate him because of his actions which Photios 1 considered wrong but Ignatios 20 did not: Photius, Ep. 23. Ignatios 20 was upset by Photios 1's rebuke and Photios 1 wrote regretting the necessity and hoping for a reconciliation: Photius, Ep. 70.

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