St. Boniface
Apostle of the Germans, Archbishop of Mainz, and martyr. At his martyrdom held up a codex of the Gospel as a shield; the book was miraculously preserved.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Carried a codex of the Gospel continually; at his martyrdom held up the codex as a shield; by miracle the book was cut through but no letter destroyed
"Among the Belgians, St. Boniface together with his companions, spreading the law of Christ, continually carried with him a codex of the holy Gospel"