St. Theodore the Studite
Monastic reformer and defender of icons. Presided over Studios Monastery after St. Plato and contended against Iconoclast Emperors.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— After St. Plato, presided over Studios Monastery around 800; contended against Iconoclast Emperors Constantine Copronymus and Leo the Isaurian
"after him Theodore the Studite, around the year of the Lord 800, left so many monuments of his genius"