In Saxo Grammaticus' 12th century work Gesta Danorum, where gods appear euhemerized, Ollerus is described as a cunning wizard with magical means of transportation:
- Fama est, illum adeo praestigiarum usu calluisse, ut ad traicienda maria osse, quod diris carminibus obsignavisset, navigii loco uteretur nec eo segnius quam remigio praeiecta aquarum obstacula superaret.
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- The story goes that he was such a cunning wizard that he used a certain bone, which he had marked with awful spells, wherewith to cross the seas, instead of a vessel; and that by this bone he passed over the waters that barred his way as quickly as by rowing.– Elton's translation
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When Odin was exiled, Ollerus was chosen to take his place. Ollerus ruled under the name Odin for ten years until the true Odin was called back, whereupon Ollerus retired to Sweden where he was slain by Danes.