Sif is introduced in chapter three of the Prologue section of the "Prose Edda"; Snorri's euhemerized account of the origins of Viking mythology. Snorri states that Thor married Sif, and that she is known as "a prophetess called Sibyl, though we know her as Sif". Sif is further described as "the loveliest of women" and with hair of gold. Although he lists her own ancestors as unknown, Snorri writes that Thor and Sif produced a son by the name of Lóriði, who "took after his father".