A Stoudite monk, Ioannes 463 was the addressee of four letters from Theodoros 15 (Theodore the Stoudite), three of them jointly with Euodios 2, all written between 815 and 818: Theod. Stud., Epp. 238, 310, 367 (all addressed Εὐοδίῳ καὶ Ἰωάννῃ τέκνοις), Ep. 253 (addressed Ἰωάννῃ τέκνῳ, in 817). He is mentioned in four other letters of Theodoros 15, written between 808 and 818: Theod. Stud., Epp. 25, 41, 43, 177. In 808 he had an audience with the patriarch Nikephoros 2 and heard him condemn the Stoudite monks as schismatics because of their stance over the Moechian dispute; he reported this to Theodoros 15 who then wrote to Nikephoros 2: Theod. Stud., Ep. 25 (Ἰωάννης ὁ σύνδουλος καὶ μαθητὴς ἡμῶν, ὡς ἀξιωθεὶς τῆς σεπτῆς σου προσκυνήσεως). He was one of the monks whom Theodoros 15 proposed to identify by means of a code letter, for security reasons, in 809: Theod. Stud., Ep. 41. In Ep. 43, in c. 809, he is mentioned with the unnamed oikonomos (i.e. Naukratios 1) and Arsenios 4. In 815/818 he and Euodios 2 probably lived together: Theod. Stud., Epp. 238, 310, 367 and cf. Epp. 253 and 254 (to Ioannes 463 and Euodios 2 respectively). He was a priest: Theod. Stud., Ep. 253, line 8. He is probably identical with one of the priests alluded to in one of Theodoros 15's sermons: Theod. Stud., Catech. Magna 84.

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