Ioannes 90 was called Neatokomites (ὁ Νεατοκόμητος), or similar; in 866 he was on the expedition against Crete; at Kepoi in Thrakesioi he found out about the plot of Basilios 7 to kill the Caesar Bardas (Bardas 5) and going to the Caesar's tent on the evening before he told Bardas's protovestiarios Prokopios 3 about it; Bardas 5 replied via Prokopios 3 telling Ioannes 90 to stop talking rubbish: Leo Gramm. 244, Georg. Mon. Cont. 830, Ps.-Symeon 678. The reply recorded in Georgius Monachus Continuatus says that he was still a young man and not fit for the dignity of patrikios, for which, it is said, he was now stirring up trouble. This implies that he was still relatively youthful and did not as yet have the dignity of patrikios, but was ambitious for it and trying to curry favour to obtain it. The date of the murder was 21 April 866 (indiction 14): Theoph. Cont. V 17, p. 238. See Winkelmann, Quellenstudien, pp. 108ff., 173.

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