Iconoclast Emperors
Byzantine emperors Constantine Copronymus and Leo the Isaurian who promulgated Iconoclasm. Theodore the Studite contended with them from the Studios monastery, slew the heresy, and consecrated the trophies of the holy faith.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Theodore the Studite contended with the Iconoclast Emperors Constantine Copronymus and Leo the Isaurian
"contending in strong combat and duel with the Iconoclast Emperors Constantine Copronymus and Leo the Isaurian, he slew the heresy"