Sigrid Undset was a renowned Norwegian author, born on May 20, 1882, in Kalundborg, Denmark, and raised in Norway. She is best known for her historical novels, particularly the trilogy "Kristin Lavransdatter," set in medieval Norway, which earned her the Nobel Prize in Literature in 1928. Her writing is celebrated for its deep psychological insight and richly detailed portrayal of Scandinavian life and history.