The runestones known as U 101 is located in Sollentuna, and U 143 and U 147 are located in Täby; all three are in Uppland, Sweden. They are all in the style Pr4 and thus dated to the period 1060-1100 during which they were carved in connection with the construction of a road from Hagby to Ed at Edsviken. They belong to a group of c. 20 runestones called the Jarlabanke Runestones that are connected to the local chieftain Jarlabanke and his clan. Together with the Broby bro Runestones and the Hargs bro runic inscriptions these particular runestones, however, centre on the female matriarch of the clan called Estrid, who was the grandmother of Jarlabanke.
The runemaster of the Snottsta runestone called U 329, where an Estrid and her brother Ragnfast are mentioned, was Fot who also made the runestones for the Jarlabanke clan. This strongly suggests that Estrid was born in Snottsta (also spelled Snåttsta), married Östen of Täby and married for the second time in Harg near Snottsta.
The rune stones that are treated in this article tell that both Estrid's sons Ingvar (whom she had with Ingvar in Harg) and Ingefast (whom she had with Östen in Broby) had died.
The runestones give further information on her family. She evidently became quite old and is mentioned on the same runestones as her grandchildren, Häming and Jarlabanke. It also appears that she had had seven children and returned to the vicinity of Täby, and probably because there she had most of her children and grandchildren.
When Stockholm County Museum made an archaeological excavation at Broby bro, in 1995, they found three graves. The three were buried in the Christian tradition, that is, with the head facing west; also, they were not burned and there were few gifts. Some coins found helped to date the graves to the 11th century. One of the graves was of an old woman and she lay buried beside a barrow that one of the Broby bro Runestones says was raised for Estrid's first husband Östen. The buried woman may have been Estrid.