St. Ludger
Apostle of the Frisians and Bishop of Munster. Came from Frisia to York to hear Alcuin and profited so much he earned the name apostle of the Frisians.
Preface and Praise of Sacred Scripture
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Chapter IV: The Judgments and Examples of the Fathers
— Came from Frisia to York to hear Alcuin; earned the name apostle of the Frisians
"St. Ludger came from Frisia to York to hear him, and profited so much that upon returning to his own people, he earned the name of apostle of the Frisians."