The Nuttall Encyclopedia
King of Burgundy; the murderer of Siegfried in the "Nibelungen Lied," who is in turn killed by Chriemhild, Siegfried's wife, with Siegfried's sword.
Wood, James, ed. Entry for 'Hagen'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/h/hagen.html. Frederick Warne & Co Ltd. London. 1900.