Olaf Gudrødsson, or as he was named after his death Olaf Geirstad-Alf, was a legendary Norwegian king of the House of Yngling from the Ynglinga saga. He was the son of Gudrød the Hunter and according to the late Heimskringla, the half-brother of Halfdan the Black. Gudrød and Olaf conquered a large part of Raumarike.
In the Ynglinga saga portion of the Heimskringla, the king is reported to have died of a "disease in his foot" (fótarverkr) or gout, although the Flateyjarbók suggests the king succumbed to a plague .
The Ynglinga saga also inserts the following verse by Þjóðólfr of Hvinir (original author of the Ynglingatal):
Og niðkvísl / í Noregi
þróttar Þrós / of þróast náði.
Réð Ólafr / ofsa forðum
víðri grund / of Vestmari.
Uns fótverkr / við Foldar þröm
vígmiðlung / of viða skyldi.
Nú liggr gunndjarfr / á Geirstöðum
herkonungr / haugi ausinn.
Long while this branch of Odin's stem
Was the stout prop of Norway's realm;
Long while King Olaf with just pride
Ruled over Westfold far and wide.
At length by cruel gout oppressed,
The good King Olaf sank to rest:
His body now lies under ground,
Buried at Geirstad, in the mound.
Olaf was worshipped after his death as an "elf", and was called the Geirstad-alf (the "elf of Geirstad"). The account of this is recorded in the Þáttr Ólafs Geirstaða Alfs in the Flateyjarbók version of Óláfs saga helga, and continues with a fantastical story of how he became a drow (draugr) haunting his own (, or grave-mound), but instructed to be destroyed so he can be reborn as Olaf the Saint.