The Gesta Danorum (Books I-IX) on Hwitserk
The Danish History, > Book Nine.
attestation: Hwitserk was one of Ragnar's sons who achieved fame through his own military campaigns
"Fridleif, and Ragbard (for Ragnald, Hwitserk, and Erik, his sons by Swanloga, had not yet reached the age of bearing arms), and went to Sweden."
attestation: Hwitserk received Daxo hospitably despite the treacherous intent, and was captured
"Hwitserk received him hospitably"
attestation: When offered a choice of death, Hwitserk chose to be burned alive rather than accept a dishonorable end
"to pluck the budding blossom of that noble nature, and offered him not only his life, but his daughter in marriage, with a dowry of half his kingdom; choosing rather to spare his comeliness than to punish his bravery."
attestation: Hwitserk, son of Ragnar, ruled Sweden in his father's name before his capture
"Hwitserk, who ruled over Sweden"