The Gesta Danorum (Books I-IX) on Swerting
The Danish History, > Book Six.
attestation: Swerting plotted to kill Frode at a banquet by treachery, but both men killed each other
"he had resolved to surprise the king under the pretence of a banquet, and burn him to death; but the king forestalled and slew him, though slain by him in return"
attestation: The sons of Swerting gave their sister in marriage to Ingild to forestall vengeance for their father's treachery
"the sons of Swerting, fearing that they would have to pay to Ingild the penalty of their father's crime, were fain to forestall his vengeance by a gift, and gave him their sister in marriage"
attestation: Starkad warns that a son of the tyrant Swerting will inherit Denmark after Ingild, whose slothful sister Ingild keeps in union
"Behold, a son of the tyrant Swerting shall take the inheritance of Denmark after thee; he whose slothful sister thou keepest in infamous union."