The Gesta Danorum (Books I-IX) on Ubbe
The Danish History, > Book Two
- attestation: Ubbe had married Ulfhild, Frode's sister, and seized the kingdom of Denmark while Frode was away
"one Ubbe, who had long since wedded Ulfhild the sister of Frode, trusting in the high birth of his wife, seized the kingdom of Denmark"
The Danish History, > Book Three.
attestation: Ubbe, a warrior of great strength and skill in incantations, volunteered to fight the Slavic champion
"It was the high-hearted Ubbe who first wiped off this infamous reproach upon the hesitating Danes. For he was of great bodily strength and powerful in incantations"
attestation: Ubbe fought despite losing the promised prize, and both champions killed each other in the duel
"falling dead under the wounds dealt by one another, they end together the combat and their lives"