Short answers, pulled from the story.
Edla was a Slavic woman of the 10th and 11th centuries who lived during the Viking Age. She was the daughter of a Lechitic tribal chief who ruled the region between the Oder and Elbe rivers, in what is now Mecklenburg-Vorpommern. She is historically significant as the mother of King Emund of Sweden and Queen Astrid of Norway.
Edla was brought to Sweden as a prisoner of war sometime between 995 and 1000. She was captured before the arrival of Estrid of the Obotrites at the Swedish court.
King Olof Skötkonung took Edla as his concubine. He later married Estrid, who became his queen, while Edla held no formal status as a wife at court.
Edla was the mother of Emund the Old, who became King of Sweden; Astrid Olofsdotter, who married King Olav II of Norway; and likely Holmfrid, who married Sven Ladejarl.
According to the chronicler Snorre Sturlasson, Edla's children were sent to foster parents away from the royal court because Queen Estrid was unkind to them. Snorre's account also implies that Edla may have died while her children were still young.
Edla was a Slavic woman, specifically the daughter of a Lechitic tribal chief. Her father's territory lay between the Oder and Elbe rivers, in the region now called Mecklenburg-Vorpommern in modern Germany.