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The Nuttall Encyclopedia
A village 2 m. N. of Freiburg, in Baden, with a castle now in ruins which gives name to the reigning grand-ducal family of Baden, the founders of which were counts of Breisgau.
Wood, James, ed. Entry for 'Zähringen'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/z/zhringen.html. Frederick Warne & Co Ltd. London. 1900.