Sigfrid of Sweden was an English missionary bishop who played a significant role in the Christianization of Scandinavia during the early 11th century. Originally from England, he is traditionally credited with baptizing Olof Skötkonung, the first Swedish monarch to steadfastly embrace the faith. His missionary work spanned various regions, including Götaland and Svealand, and he also spent time in Norway. He is often regarded as a primary figure in the expansion of Christianity within the Swedish kingdom during this formative period.