Estrid Svendsdatter

Estrid Svendsdatter of Denmark (Estrith, Astrith: 990/997 – 1057/1073), was a Danish princess and titular Queen, a Russian princess and, possibly, Duchess of Normandy by marriage. She was the daughter of Sweyn Forkbeard and perhaps Gunhild of Wenden and sister of Cnut the Great. By Ulf Jarl, she was the mother of the later King Sweyn II Estridson and Beorn Estrithson. The dynasty that ruled Denmark in 1047–1412 was named after her. She was known in Denmark as Dronning Estrid, (Queen Estrid), despite the fact that she was not married to a King and not a queen regnant.

According to other researchers Estrid was the daughter of Sweyn Forkbeard and Sigrid the Haughty, herself the daughter of Skagul Toste, making Olof Skötkonung, the son of Sigrid the Haughty and Eric the Victorious, Estrid's half-brother and Canute the Great, Harald and Świętosława her other half-siblings, as children of Sweyn Forkbeard and the Polish princess Gunhild, daughter of Mieszko I of Poland.

Estrid was born around 990 or around 997. In 1014, her father died. She was reportedly married briefly to an unnamed Russian Prince (perhaps Vsevolod, Prince of Vladimir-Volynsk, son of Grand Prince Vladimir I the Great), who died following the Rus' war after the death of the Grand Prince 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. Ralph Glaber in his 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 disagree whether it was a short-lived marriage, a betrothal, or a result of confusion.

...
Wikipedia