Title: Estrid Svendsdatter
Content:  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 half-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. Though never a ruler or wife of a king, she was known in Denmark as queen during her son's reign. 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 while 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.
Title: Estrid Svendsdatter
Content:  not lose her brother's trust, and was granted large lands by him. She gave her son an education by the church, made donations to the church and is believed to have founded the first church made of stone in Denmark (Roskilde Cathedral). She supported her son's struggle to gain dominance over Denmark. In 1047, her son became king in Denmark due to his mother's descent, and is hence known by the matronymic Sven Estridssen ('son of Estrid'). Estrid herself was granted the honorary title of Queen (not Queen mother), the very same variation of the title normally reserved for 
Title: Estrid Svendsdatter
Content:  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 
Title: Estrid Svendsdatter
Content:  Estrid was widely believed to have been buried in the northeastern pier of the Roskilde Cathedral, but a DNA test in 2003 dispelled the myth as the remains belonged to a woman much too young to be Estrid. The new theory is that the sign on the pier refers to Margareta Hasbjörnsdatter, who was also known as Estrid and who married Harald III Hen, the son of Sweyn Estridsen.
Title: Estrid
Content:  Estrid (Old Norse: Æstriðr, Ástríðr) was a rich and powerful 11th-century Swedish woman whose long family saga has been recorded on five or six runestones in Uppland, Sweden. This Estrid was the maternal grandmother of the chieftain Jarlabanke of the Jarlabanke clan. The family were rich landowners and belonged to the higher echelons of Swedish society, and she was probably named after Estrid of the Obotrites, who was the queen of Sweden, and the consort of Olof Skötkonung, at the time Estrid was born. Her family saga has been the centre of a dramatisation at the Stockholm County Museum. It is safe to assume that five of the 11 
Title: Sigrid the Haughty
Content:  to the Battle of Swold, in which Olaf fell. Snorri also claims that Estrid Svendsdatter was a paternal sister of Cnut the Great, and as a daughter of Sigrid was maternal sister to Olav the Swede, but in another place says that Estrid was a daughter of Gunhild of Wenden. The Danish historian Saxo Grammaticus would repeat this information, writing that Eric the Victorious' widow Syritha had married Sweyn Forkbeard after having spurned Olaf Trygvasson. One further point that has been cited in favor of Sigrid's historical existence is that the holdings of the Danish kings in medieval Sweden were known as "Syghridslef" - 'the legacy of Sigrid'.
Title: Estrid of the Obotrites
Content:  Estrid of the Obotrites (c. 979 – 1035) was Queen of Sweden in the Viking age, a West Slavic princess married to Olof Skötkonung, King of Sweden c. 1000&ndash;1022. She was the mother of King Anund Jacob of Sweden and the Kievan Rus' saint and grand princess Ingegerd Olofsdotter.
Title: Estrid of the Obotrites
Content: " Queen Estrid was arrogant and not kind towards her stepchildren, and therefore the king sent his son Emund to Vendland, where he was brought up by his maternal relatives". Legend says that Estrid was taken back to Sweden from a war in the West Slavic area of Mecklenburg as a war-prize. She was most likely given by her father, a tribal chief of the Polabian Obotrites, as a peace offering in a marriage to seal the peace, and she is thought to have brought with her a great dowry, as a great Slavic influence is represented in Sweden from her time, mainly among craftsmen. Her husband also had a mistress, Edla, who came from the same area in Europe as herself, and who was possibly taken to Sweden at the same time. The king treated Edla and 
Title: Estrid
Content:  bro runic inscriptions, where we learn that Estrid had married a man named Ingvar, and this Ingvar had a son prior to marrying Estrid whose name was Ragnvald. It also appears that Estrid and Ingvar had three sons named Sigvid, Ingvar and Jarlabanke. We further learn that Estrid had a bridge constructed, which apparently was a tradition in her family. She appears to have become quite old and moved back to Täby where she had family, because the last chapter of her life is documented on two runestones in south-western Täby. They tell that Estrid cleared a road and built bridges together with her grandson Jarlabanke (by her 
Title: House of Estridsen
Content:  The House of Estridsen was a dynasty that provided the kings of Denmark from 1047 to 1412. The dynasty is named after its ancestor Estrid Svendsdatter. The dynasty is sometimes called the Ulfinger, after Estrid's husband, Ulf the Earl. The dynasty also provided three of the rulers of Sweden in the years 1125–1412. Their family coat of arms became the coat of arms of Denmark and therefore influenced the coat of arms of Tallinn and the coat of arms of Estonia. The Royal Court of Denmark does not differentiate between different royal houses among the early Danish kings, but uses the term "the descent of Gorm the Old" about all the pre-Oldenburg monarchs.

Question: Who is the father of Estrid Svendsdatter?
Answer: Sweyn I of Denmark.
Sweyn Forkbeard.
Sweyn, King of Denmark.