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In page Sigrid Undset:

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Undset and Svarstad were married in 1912 and went to stay in London for six months. From London, they returned to Rome, where their first child was born in January 1913.[1] 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,[1] as was one of Svarstad's sons by his first wife.[citation needed]