Research suggests that this person may never have existed. See narrative for details
Relationships between historical figures could have been simplified or even fabricated in the text to give the impression that succession remained within the same family….Precise chronology is also difficult to assess from the Sagas….The conclusion must be that the tight family network described in the Sagas is unlikely to be correct and that the relationships shown below should be treated with considerable caution. http://fmg.ac/Projects/MedLands/NORWEGIAN%20NOBILITY.htm
-Dotter, -Datter, -Dottir are all the same ending, meaning "daughter" in Scandinavia, and attached behind the father's first name. A woman kept her birth name all her life and did not take on her husband's last name as her own until about 100-200 years ago.
09 MAY, : Burial: Cathedral Roskilde, Roskilde, Roskilde, Denmark1057
ALTERNATE DATES: 990-1058
ESTRID [Margrete] Svendsdatter, daughter of SVEND I "Tveskæg/Forkbeard" King of Denmark & his wife his second wife Sigrid “Storråda/the Haughty” married Ulf Thrugilson
Father: Ulf Thorgilssons of Denmark (988 - 1026)
Signe Asbjørn Daughter (1050 - 1086)
Wikipedia: She was reportedly married briefly to an unnamed Russian Prince, who died following the Russian war after the death of grand prince Vladmir in 1015. After her brother's elevation to the throne of England, he made an agreement with Richard II of Normandy that Estrid was to marry Richard's son Robert. It is not known whether this marriage ever took place. Historiarum libri quinque reported that an unnamed sister of Cnut married Robert, but Adam of Bremen reports a marriage of Estrid (calling her Margaret) to Richard II, indicating that after he went to Jerusalem she married Ulf, yet although Richard never went to Jerusalem Robert did. Norman sources do not mention such a marriage for either duke, and historians have disagree whether it was a short-lived marriage, a betrothal, or a result of confusion.
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Adam of Bremen reports a marriage of Estrid (calling her Margaret) to Richard II, indicating that after he went to Jerusalem she married Ulf, yet although Richard never went to Jerusalem Robert did. Norman sources do not mention such a marriage for either duke, and historians disagree whether it was a short-lived marriage, a betrothal, or a result of confusion.