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Rabanus Maurus Magnentius ( 780 - 4 February 856), also known as Hrabanus or Rhabanus, was a Frankish Benedictine monk, theologian, poet, encyclopedist and military writer who became archbishop of Mainz in East Francia. He was the author of the encyclopaedia De rerum naturis ("On the Natures of Things"). He also wrote treatises on

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