Ioannes 488 was a former sakellarios of Petros (the former strategos of Numidia, in c. 631; see PLRE III, p. 1013, Petrus 70); Ioannes 488 was present at the questioning of Maximos 10 (Maximus the Confessor) soon after the latter was brought from the West to Constantinople, and he made the first allegation against Maximos 10, that he had betrayed Egypt to the Saracens; Ioannes 488 claimed that when the emperor Heraklios had ordered Petros to gather troops and proceed to Egypt against the Saracens, Petros had written to Maximos 10 asking his advice and Maximos 10 had replied advising him not to do so since God was displeased with the emperor and his family; when Maximos 10 demanded that Ioannes 488 produce one or both letters, Ioannes 488 admitted that he was only repeating gossip current in the camp at the time: Relatio Motionis I, 112A (Ἰωάννην τὸν γενόμενον σακελλάριον Πέτρου τοῦ γενομένου στρατηγοῦ Νουμηδίας τῆς Ἀφρικῆς).

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