Sigurd Snake in the Eye or Sigurd Ragnarsson, (Old Norse: Sigurðr ormr í auga) was one of the sons of Ragnar Lothbrok and Aslaug, but what distinguishes him from the other brothers is that he was born with the image of ouroboros, a snake or dragon biting its own tail, surrounding the pupil of his left eye.
In the Ragnarsson's tale the saga cites that upon his father's death, he inherited Selandia, Skåne, Halland, the Danish islands and Viken. He married Blaeja (or Heluna), the daughter of King Aelle of Northumbria and they had three sons:
Together with his brothers Björn Ironside and Halfdan, after they had finished their raids in France and after Björn's return home to Sweden, they were attacked by Emperor Arnulf of Carinthia. In the battle 100,000 Danes and Norwegians fell, including Sigurd and King Guðrøðr.