thumb|250px|The Eysteinn tumulus (Östens hög) in West Aros near Enköping has been linked to King Eysteinn by some popular historians.Eysteinn (d. ca 600), Swedish: Östen, was the son of Eadgils and Yrsa of Saxony. He was the father of Ingvar.
Snorri Sturluson relates that Eysteinn ruled Sweden at the time when Hrólf Kraki died in Lejre. It was a troubled time when many sea kings ravaged the Swedish shores. One of those kings was named Sölve and he was from Jutland (but according to Historia Norwegiae he was Geatish, see below). At this time Sölve was pillaging in the Baltic Sea and so he arrived in Lofond (probably the island of Lovön or the Lagunda Hundred), where Eysteinn was at a feast. It was night-time and Sölve and his men surrounded the house and set it on fire burning everyone inside to death. Then Sölve arrived at Sigtuna (Old Sigtuna) and ordered the Swedes to accept him as king. The Swedes refused and gathered an army that fought against Sölve and his men, but they lost after eleven days. The Swedes had to accept him as king for a while until they rebelled and killed him.

Snorri then quotes a stanza from Þjóðólfr of Hvinir's Ynglingatal:

The Historia Norwegiæ presents a Latin summary of Ynglingatal, older than Snorri's quotation (continuing after Eadgils, called Adils or Athisl):

Thorsteins saga Víkingssonar makes Eysteinn the father of Anund and grandfather of Ingjald and consequently skips Ingvar's generation. It adds a second son to Eysteinn named Olaf, who was the king of Fjordane in Norway.