Ioannes 443 was metropolitan bishop of Herakleia (?in Thrace); he was the addressee of three letters from the patriarch Photius (Photios 1): Photius, Ep. 9 (April 862/April 866), Ep. 28 (summer 866), Ep. 218 (October 867/872) (all addressed Ἰωάννῃ μητροπολίτῃ Ἡρακλείας). One letter (Ep. 28) alludes to the current civil war involving the "Armenian", i.e. Symbatios 1, and refers to the upheavals in Asia (σείεται σχεδὸν ἡ Ἀσία πᾶσα ἐμφυλίῳ στάσει). He was no longer in office in 886, when the see of Herakleia was empty. He was present at the Council of 869, on 24 November 869: Mansi XVI 89B, 360A. He is not to be confused with the other Ioannes of Herakleia, who was an opponent of Photios 1; see Mansi XVIIA 373B, 500D (the Council of 879-880) (in PBE II).

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