Ongentheow
Ongentheow (Old English: Ongenþeow, Ongenþio, Ongendþeow; Swedish: Angantyr) (died ca. 515) was the name of a semi-legendary Swedish king of the house of Scylfings, who appears in Old English sources.
He is generally identified with the Swedish king Egil Vendelcrow mentioned in Ynglingatal, Historia Norwegiae and in Ynglinga saga.
The reason why they are thought to have been the same is that they have the same position in the line of Swedish kings and are described as the fathers of Ohthere and grandfathers of Eadgils.
The name Ongentheow contains as its second element þeōw "servant, slave". The first appears to be ongēan "against, opposite".
Old English sources
In the Old English epic Beowulf Ongentheow is described as a fearsome warrior and it took two warriors Eofor and Wulf Wonreding to take him down.
The epic tells that the Geats under their new king Hæþcyn captured the Swedish queen, but old king Ongenþeow saved her, at a hill fort called Hrefnesholt, although they lost her gold. Ongentheow killed Hæþcyn, and besieged the Geats at Hrefnesholt. The Geats were, however, rescued by Hygelac, Hæþcyn's brother, who arrived the next day with reinforcements. Having lost the battle, but rescued his queen, Ongenþeow and his warriors returned home.