Ioannes 14 was a eunuch (εὐνοῦχον), he was oikeiakos (οἰκειακὸν αὐτῆς) on the personal staff of the empress Eirene 1 and held office in June 781 as sakellarios (τὸν σακελλάριον); in that month he was appointed commander of the combined armies of Asia which Eirene 1 sent against the Arabs (τῷ δὲ Ἰουνίῳ μηνὶ ἀπέστειλε πάντα τὰ περατικὰ θέματα εἰς τὰς κλεισούρας φυλάττειν καὶ ἐπιτηρεῖν τὴν ἔξοδον τῶν Ἀράβων, ἐπιστήσασα αὐτοῖς κεφαλὴν Ἰωάννην τὸν σακελλάριον, εὐνοῦχον ὄντα καὶ οἰκειακὸν αὐτῆς); he won an important victory over the Arabs under Qebir 1 at the battle of Melon: Theoph. AM 6273. The actual Byzantine commanders in this battle were Michael 5 and Tatzates 1 with Ioannes 14 as the figurehead: see Tritle, "Tatzates' Flight", Byz 47 (1977), pp. 286-290. Possibly identical with either Ioannes 18 or Ioannes 522. In 781 Michael 5 and Tatzates 1 defeated the Arab general Kebir (`Abd al-Kabir, = Qebir 1) at the battle of Melon: Tabari (in Brooks, EHR 15 (1900), p. 737) (his name is omitted by Theophanes AM 6273). He was possibly succeeded as sakellarios by Konstaes 1.

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