Estrid Svendsdatter

Ralph Glaber in his Historiarum libri quinque[9][10] 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.

[4] 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').

Ulf's sister was Gytha married to Earl Godwin, and put her family firmly in the Anglo-Scandinavian camp.

[12] The date of her death is unknown, but it can be no earlier than 1057 or later than 1073, as it is known that Bishop William of Roskilde officiated at her funeral, and he was in office between 1057 and 1073.

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.