Charlemagne
King and Emperor called "thrice-greatest -- in learning, piety, and military glory." Established schools of Sacred Letters at Paris and elsewhere, and near death corrected the four Gospels against Greek and Syriac manuscripts.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Alcuin was his teacher or close companion
"either the teacher or rather the close companion of Charlemagne"
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Chapter IV: The Judgments and Examples of the Fathers
— "Thrice-greatest — in learning, piety, and military glory"; established schools of sacred Letters; corrected four Gospels against Greek and Syriac near death
"King and Emperor Charlemagne, or rather thrice-greatest"