When Brita Olofsdotter was born on 26 February 1739, in Björskog, Västmanland, Sweden, her father, Olaf Zackrisson, was 26 and her mother, Mrs. Olof Zackrisson, was 22. She married Andreas Mårtensson on 19 October 1755. They were the parents of at least 2 sons and 7 daughters. She died on 23 November 1817, in Bjorskog, Västmanland, Sweden, at the age of 78.