She is reported by Heimskringla to have been the wife of Eric the Victorious of Sweden, as being sought after by Olaf Tryggvasson, and then married to Sweyn Forkbeard of Denmark.

Some recent scholars identify her with a documented Polish wife of Eric and perhaps Sweyn mentioned by medieval chroniclers and referred to as 'Świętosława' by some modern historians, but the potential husbands attributed to Sigrid lived over a wide date range and other modern scholars believe Sigrid may be an amalgamation of several historical women.

[1] Sigrid appears in the 12th-century saga, Yngvars saga víðförla, which when speaking of Swedish King Eric the Victorious says, "Hann átti Sigríði ina stórráðu ok skildi við hana sakir óhægenda skapsmuna hennar, því at hún var kvenna stríðlyndust um allt þat, er við bar.

)[3] She also receives brief mention in the genealogical appendix to Hervarar saga ok Heiðreks, which likewise when discussing Eric states "Hann átti Sigríði ina stórráðu."

After a few further cursory words, Sigrid rode away, and Harald again turned sullen before deciding to ride to her home to press his case.

This mentions her while giving very similar accounts of Harald Grenske to those found in Haralds saga gráfeldar and Óláfs saga Tryggvasonar, with the only novel information being another passage relating a marriage between Olaf Tryggvason's sister Ingibjorg, and Sigrid's nephew Jarl Rognvald, son of her brother Ulf.

There she is described as mother of Estrid Svendsdatter, the paternal (half-)sister of Cnut the Great and maternal half-sister of Swedish king Olaf.

[7] The Danish historian Saxo Grammaticus has similar information as the Heimkringla, writing that Eric the Victorious' widow Syritha had married Sweyn Forkbeard after having spurned Olaf Trygvasson.

For instance, Tove of the Obotrites, daughter of the Vendic lord Mistivoj, married King Harald Bluetooth of Denmark in the 960s.

Chronicler Thietmar of Merseburg reported that a daughter of first duke of the Polans Mieszko I, unnamed in the original source but hypothesized to have been named 'Świętosława' by some modern historians,[8] married Sweyn, and by him was mother of Harald and Cnut, while writing slightly later Adam of Bremen reported that this same Polish princess had earlier married Eric, having Olaf by him.

This solution may further make her identical to the woman that the same saga gives as Sweyn's first queen, 'Gunhild', daughter of 'Burislav', suggested to be a confused rendering of the same historical marriage to the sister of Boleslav of Poland.

Despite this, the erroneous dating became intertwined with numerous episodes of Scandinavian intrigue, as the theory was elaborated to serve a variety of agendas of kings and nobles prior to its redating.

[citation needed] Other legend states that Sigrid is buried at the Puke Stone (Swedish: Pjukesten) along the Gotaleden [sv] hiking trail.