Pope Stephen III
Whilst Constantine was in prison, there was an attempt to install another antipope, Philip, followed by the election of Pope Stephen III. After his election, followers of the new pope began attacking key members of Constantine’s regime, including Bishop Theodore, the Vice-dominus and Constantine’s brother, Passivus, both of whom were blinded. Constantine was taken from prison, put on a horse and driven through the city on top of a woman’s saddle, with heavy weights attached to his feet, among jeering crowds. He was then imprisoned in the monastery of San Saba.