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Sögubrot tells that he married the fugitive princess Auðr the Deep-Minded without the consent of her father king Ivar Vidfamne, who soon departed to punish his daughter. He died, however, on route, and so Ráðbarðr helped Auð's son Harald Wartooth claim his maternal grandfather's possessions in Sweden and Denmark.
Ráðbarðr and Auðr had a son together named Randver.