Hagen Keller
Ruedi Hagen Keller (born 2 May 1937, in
Freiburg im Breisgau, Germany) is a German
historian specializing in the history of the
early and
high Middle Ages. He works mainly on the
Ottonian period, the Italian
communes, and the culture of writing in the Middle Ages. Keller taught as Professor of Medieval History at the
University of Münster from 1982 until his retirement in 2002. His collaboration with his colleague
Gerd Althoff was particularly fruitful. With their work, Keller and Althoff made a decisive contribution to Münster's reputation in international
medieval studies. Keller's research has had a considerable influence on German and international medieval studies since the 1980s and has led to a reassessment of early and high medieval kingship.
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