Erlendur was born 11 August 1844 at Stor i Lambhagi, Leira, Borgarfjardar. His parents are Arni Bergthorsson, born 3 May 1798 at Hafthorsstadir, Hvammur i Nordurardal, Myra; and Malfridur Gudlaugsdottir, born 21 July 1804 at Kollslaekur, Stir i As, Bordarfjardar, died 2 June 1869. Erlendur immigrated to Canada in 1876, where he spent a couple of years in the settlement called “New Iceland” on the west shores of Lake Winnipeg. Like many others, he moved on and went to the Dakota Territory. About 1880 he came to Spanish Fork, Utah. He wanted to follow the trade of goldsmith and learn more about The Church of Jesus Christ of Latter-day Saints. He was a great reader and writer. He owned an agency for selling men’s suits. He would fit them and then order from a catalog. He was a practicing calligrapher. He wrote such beautiful handwriting that people would have him prepare their important records.
Erlendur married Johanna Jonsdottir, born 10 March 1856 in Rangarvalla, the daughter of Jon Bjarnason. They had two children: Autna Julius and Steinunn (Stana). Their marriage ended in divorce. He then went to Scofield and Winter Quarters in Carbon County to work in the coal mines. About this time he started to correspond with Katrin Jonsdottir, who was living in Winnipeg and working as a nurse at the time. She came to Spanish Fork in 1893 and married Erlendur 19 August 1893. They made their home in Winter Quarters, where Erlendur worked in the mines. They had six children: Katie, John, Olga, Ella, Cornella and Elma. Erlundur and Katrin split, and she went to Blaine, Washington, where she died 17 January 1944. She is buried in the Blaine Cemetery. Erlundur never went to Blaine, Washington. He died in Salt Lake City 12 September 1918 and is buried in the Salt Lake City Cemetery. Erlundur is number 7 in Icelanders of Utah.