Ioannes 439 became metropolitan bishop of Chalcedon in succession to Kosmas 56, and was in office already in 816; addressee of two letters from Theodoros 15 (Theodore the Stoudite) between 816 and 818; he supported the veneration of icons and suffered persecution under Leo V (Leo 15), when he was imprisoned somewhere outside Constantinople: Theod. Stud., Ep. 245, 312. He is to be identified with the unnamed metropolitan of Chalcedon mentioned in Theod. Stud., Ep. 471 (τοῦ τῆς Χαλκηδόνος ἁγιωτάτου μητροπολίτου καὶ πατρὸς ἡμῶν) (to Gregorios 139, to whom Theodoros 15 had written previously and more briefly about Ioannes 439). Also called Kamoulianos; he was metropolitan bishop of Chalcedon; he was one of a number of bishops and hegoumenoi who assembled at the Church of St Elias at one of the metochia of the monastery of the Agauroi (near Prousa, on Mt Olympus in Bithynia), where they met the hermit Ioannikios 2: Sabas, Vita Ioannicii 28 (Ἰωάννης, Χαλκηδόνος μητροπολίτης, ὁ ἐπίκλην Καμουλιανός), Petrus, Vita Ioannicii 36 (ἐκ μὲν τῶν μητροπολιτῶν ὁ παναγιώτατος Ἰωάννης, ὁ Χαλκηδόνος). The others present included Theodoros 15 (Theodore the Stoudite), Petros 49 (bishop of Nikaia), Klemens 1 and Ioseph 18. The date was perhaps in 821, when Theodore the Stoudite (Theodoros 15) was in that vicinity. Ioannes 439 died of spotted fever: Theod. Stud., Catech. Parva 22. The date was between 821 and 826 (when Theodoros 15, who attended his funeral, died). The Kamoulianoi were apparently an aristocratic family; cf. Theodoros 14 and Demetrios 2, and Winkelmann, Quellenstudien, 155. Possibly identical with Ioannes 519.

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