The Gesta Danorum (Books I-IX) on Ragnhildr
The Danish History, > Book One.
relationship: Ragnhild was the daughter of Hakon, King of the Nitherians
"Ragnhild, daughter of Hakon, King of the Nitherians"
attestation: A giant had claimed Ragnhild in betrothal, which Hadding found ignominious
"a certain giant had taken in troth Ragnhild, daughter of Hakon, King of the Nitherians; and, loathing so ignominious a state of affairs"
attestation: Ragnhild tended Hadding's wounds without knowing his identity and hid a ring inside one of his wounds as a recognition token
"The maiden, not knowing him, ministered with healing tendance to the man that had done her kindness and was bruised with many wounds. And in order that lapse of time might not make her forget him, she shut up a ring in his wound"
attestation: Ragnhild later chose Hadding as her husband at a banquet by feeling the assembled men's bodies and finding the hidden ring
"All the rest she rejected, but Hadding she discovered by the sign of the secret ring; then she embraced him, and gave herself to be the wife of him who had not suffered a giant to win her in marriage"