Ragnvald Heidumhære
Ragnvald Heidumhære (or Rognvald) was a semi-historical petty king or chieftain of Vestfold in what is today Norway in the 9th century, according to "Ynglingatal" and to "Ynglinga saga" in "Heimskringla". He was apparently a member of the Yngling clan (mentioned in later Norse and Anglo-Saxon literature, such as "Beowulf"). His name "Heiðumhæri" could be translated as "highly honoured" His greatest contribution to posterity was that he asked the skald Þjóðólfr of Hvinir to compose a poem about his ancestry. This poem is known as "Ynglingatal" and is not only one of the oldest, but also  one of the most famous and debated of the Old Norse poems. Þjóðólfr ended the poem with these lines: Family. Traditional sources differ as to whether Ragnvald Heidumhære was the son of Ragnar Lodbrok or of Olaf Geirstad-Alf. The 13th-century account in "Heimskringla", which uses "Ynglingatal" as a source, makes Ragnvald a cousin of Harald Fairhair. A dubious, later pedigree attributes to Ragnvald a daughter, Åsa Ragnvaldsdatter ("Aseda Rognvaldsdatter"), who married Eystein Ivarsson. It is through this line that Ragnvald Heidumhære is a purported ancestor of William the Conqueror (and subsequent British royal houses).