"Apparently," writes Jeffrey Richards, "some prominent Ravennates were involved in the revolt which overthrew Justinian and when he returned to power he determined to revenge himself on the entire city."
[1] In response, the citizens and soldiers of Ravenna rebelled, making one George the son of Johannicus their leader, whose father was one of the captives taken to Constantinople.
[2] John was appointed Exarch not long after this, and landed at Naples with loyal troops, where he encountered Pope Constantine responding to an Imperial summons to Constantinople.
The Liber Pontificalis does record that in Ravenna "by God's judgment on his atrocious deeds he [John] died an ignominious death".
[4] The strategos of Sicily, Theodore, was placed in charge of the latter, and imprisoned and executed the leaders of the Ravennese revolt, including Archbishop Felix, who was deported to Constantinople, blinded and exiled to the Crimea.