Poetic Genealogy

Beowulf gives Hygelac's genealogy: according to the poem, he was the son of Hrethel and had two brothers Herebeald and Hæþcyn, as well as an unnamed sister who was married to Ecgtheow and was the mother of the hero Beowulf. Hygelac was married to Hygd, and they had a son Heardred and an unnamed daughter who married Eofor. When Hygelac's brother Hæþcyn was fighting with the Swedes, Hygelac arrived at Hrefnesholt one day too late to save his brother Hæþcyn, but he managed to rescue the surviving Geatish warriors, who were besieged by the Swedish king Ongentheow and his three sons. The Swedes found refuge at a hill fort but were assaulted by the Geats. In the battle, the Swedish king was slain by Eofor. After the death of his brother Herebeald, Hygelac ascended the Geatish throne. After he was killed during a raid on Frisia (by a grandson of Clovis I), Hygelac was succeeded by Heardred, according to Beowulf.
https://en.wikipedia.org/wiki/Hygelac