Einhard
Frankish scholar and biographer of Charlemagne. In his Life of Charlemagne, records the emperor's diligent correction of reading and chanting discipline.
Works
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— In his Life of Charlemagne, says Charlemagne most diligently corrected reading and chanting discipline
"as Einhard says in his Life"