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The Nuttall Encyclopedia
King of Sweden, under whose reign the nobles divided themselves into the two factions of the Caps, or the peace-party, and the Hats, or the war-party (1710-1771).
Wood, James, ed. Entry for 'Adolf, Friedrich'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/a/adolf-friedrich.html. Frederick Warne & Co Ltd. London. 1900.