“The Lady of the Lake” by Walter Scott — a free Project Gutenberg ebook, available to read as an EPUB on BookMarket.
Subjects: Arthurian romances; Lady of the Lake (Legendary character) -- Romances. Original source: https://www.gutenberg.org/ebooks/3011.
This ebook is in the public domain in the United States; the Project Gutenberg eBook license applies to the original text.