Ioustos 2 was the adopted son and pupil of the Paulician ("Manichaean") leader Konstantinos 1, whom he stoned to death on the orders of Symeon 1; the site was near Koloneia in Armenia; some years later, after Symeon 1 himself had become a leader of the heresy, he and Ioustos 2 argued over the interpretation of a statement of St Paul and Ioustos 2 approached the bishop of Koloneia for his interpretation but in so doing revealed details of the sect and its heresy; the bishop informed the emperor Justinian II (Ioustinianos 1) who ordered an enquiry and had those who failed to repent burnt; Ioustos 2 was presumably one of the victims: Peter of Sicily, 105, 110-111.

(Publishable link for this person: )