The Nuttall Encyclopedia
Lady of the Lake
The name given to Vivien, the mistress of Merlin, who dwelt in an imaginary lake, surrounded by a court of knights and damsels; also to Helen Douglas, a heroine of Scott's, who lived with her father near Loch Katrine.
Wood, James, ed. Entry for 'Lady of the Lake'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/l/lady-of-the-lake.html. Frederick Warne & Co Ltd. London. 1900.