Eysteinn
Eysteinn (Swedish: Östen; died ca 600) was the son of Eadgils and Yrsa of Saxony.
He was the father of Ingvar.
The Eysteinn tumulus "(Östens hög)" in Västerås near Östanbro has been linked to King Eysteinn by some popular historians.
The term Hög is derived from the Old Norse word "haugr" meaning mound or barrow.
Eysteinn ruled Sweden at the time when Hrólf Kraki died in Lejre.
It was a troubled time when many sea kings ravaged 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.
He arrived in Lofond (probably the island of Lovön or the Lagunda Hundred), where Eysteinn was at a feast.
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 until they rebelled and killed him.
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Eadgils
Eadgils, "AdilsAðilsAdillusAðísl at UppsölumAthislAthislus" or "Adhel" was a semi-legendary king of Sweden, who is estimated to have lived during the 6th century.
"Beowulf" and Old Norse sources present him as the son of Ohthere and as belonging to the ruling Yngling (Scylfing) dynasty.
These sources also deal with his war against Onela, which he won with foreign assistance: in "Beowulf" he gained the throne of Sweden by defeating his uncle Onela with Geatish help, and in two Scandinavian sources ("Skáldskaparmál" and "Skjöldunga saga"), he is also helped to defeat Onela in the Battle on the Ice of Lake Vänern, but with Danish help.
However, Scandinavian sources mostly deal with his interaction with the legendary Danish king Hrólfr Kraki (Hroðulf), and Eadgils is mostly presented in a negative light as a rich and greedy king.
Snorri Sturluson, who documented many of the Scandinavian traditions, reported that the Swedes called him a "great king".
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Question: Who is Eysteinn's paternal grandfather?
Answer: Ohthere