was born in January 1913. A boy, he was named after his father. In the years up to 1919, she had another child, and the household also took in Svarstad's three children from his first marriage. These were difficult years: her second child, a girl, was mentally handicapped, as was one of Svarstad's sons by his first wife. She continued writing, finishing her last realistic novels and collections of short stories. She also entered the public debate on topical themes: women's emancipation and other ethical and moral issues. She had considerable polemical gifts, and was critical of emancipation as it was developing, and of the moral and ethical decline she felt was threatening in the wake of the First World War. In 1919, she moved to Lillehammer, a small town in the Gudbrand Valley in southeast Norway, taking her two children with her. She was then expecting her third child. The intention was that she should take a rest at Lillehammer and move back to Kristiania as soon as Svarstad had their new house in order. However, the marriage broke down and a divorce followed. In August 1919, she gave birth to her third child, at Lillehammer. She decided to make Lillehammer her home, and within two years, Bjerkebæk, a large house of traditional Norwegian timber architecture, was completed, along with a large fenced garden with views of the town and the villages around. Here she was able to retreat and concentrate on her writing. Kristin Lavransdatter trilogy and The Master of Hestviken tetralogy After the birth of her third child, and with a secure roof over her head, Undset started a major project: Kristin Lavransdatter. She was at home in the subject matter, having written a short novel at an earlier stage about a period in Norwegian history closer to the Pre-Christian era. She had also published a Norwegian retelling of the Arthurian legends. She had studied Old Norse manuscripts and Medieval chronicles and visited and examined Medieval churches and monasteries, both at home and abroad. She was now an authority on the period she was portraying and a very different person from the 22-year-old who had written her first novel about the Middle Ages. It was only after the end of her marriage that Undset wrote her masterpiece. In the years between 1920 and 1927, she first published the three-volume Kristin, and then the 4-volume Olav (Audunssøn), swiftly