Björn Björnsson was born on May 29, 1873 in N. Múlasýsla. He died in Marshall, Minnesota on September 3, 1929. He took the name Bjorn B. Gislason in the west.
Spouse: October 7, 1904 in Minneapolis; Jóhanna Þórunn Jónatansdóttir b. November 18, 1872, d. April 13, 1948. She took the name Joan Thorunn Peterson in the west.
Children: 1. Brentwood b. August 1, 1904 2. Rose Joan b. August 18, 1906 3. Sidney Payson b. May 22, 1908 4. James b. 1912, d. 1935.
Björn emigrated west to Minnesota in 1879 with his parents, Björn Gíslason, and his wife, Aðalabjörg Jónsdóttir, and his siblings. They settled in Lyon County. Björn grew up there, attended country school, and graduated from the University of Minnesota in 1900. He practiced law in Minneota, Minnesota and lived there. Jóhanna came to Minnesota in 1878 with her parents, Jónatan Jónatansson and Kristín Jónsdóttir, and her siblings. Jónatan emphasized the education of his children, and Jóhanna became the first Icelandic girl to complete a degree from the University of Minnesota.