Ragnvald (or Rognvald) "the Mountain-High" Olafsson was a petty king of Vestfold in what is today Norway. He was the son of Olaf Geirstad-Alf, a cousin of Harald Fairhair and the father of Åsa Ragnvaldsdatter (Aseda Rognvaldsdatter), who married Eystein Ivarsson.
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: