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Abrogans, also German Abrogans or Codex Abrogans (St Gall, Stiftsbibliothek, Cod. 911), is a Middle Latin–Old High German glossary, whose preserved copy in the Abbey Library of St Gall is regarded as the oldest preserved book in the German language.
Dating from the 8th century (765–775) , the glossary contains approximately 3,670 Old High German words in over 14,600 examples and is therefore a valuable source for the knowledge of the oldest Upper German language. It was named by German researchers after its first entry: abrogans = dheomodi (Modern German: demütig = modest, humble).
On several occasions the South Tyrolean bishop Arbeo of Freising († 783 or 784) or the Benedictine monk Kero are named as authors.