Despite some deviations, the book's historical framework is genuine and the fictional story is woven into real events. Many characters are historical figures, including Jeremi Wiśniowiecki and Bohdan Khmelnytsky (Polish: Bohdan Chmielnicki). Sienkiewicz researched memoirs and chronicles of the Polish nobility, or szlachta, for details on life in 17th-century Poland. The book was written, according to the author, "to lift up the heart" of the Polish...