Ragnvald Ulfsson

beginning 11th century) was a jarl of Västergötland or Östergötland and was married to a sister of King Olav Tryggvason.

He was married to Ingeborg Tryggvasdotter, daughter of Tryggve Olavsson, son of Olaf Haraldsson Geirstadalf and grandson of King Harald Fairhair.

[2] When Olaf Haraldsson became king of Norway in 1015, a war erupted with Sweden and Norwegians forces had pillaged in Västergötland.

[5] During a visit by the skald Sigvatr Þórðarson, Ragnvald learned that Prince Yaroslav I the Wise of Kievan Rus' had proposed to Ingigerd, and so he developed the idea that King Olaf should marry Astrid Olofsdotter, an illegitimate daughter of Olof Skötkonung, who was staying with Ragnvald.

In addition to the poem, Fagrskinna only briefly mentions Ragnvald, while Heimskringla contains a more elaborate account of him.