Ynglinga Saga
Snorri Sturluson related that the Swedish king Ingjald Ill-ruler married his daughter Åsa to king Guðröðr of Scania. Åsa was her father's daughter and made Guðröðr murder his own brother Halfdan, the father of Ivar Vidfamne. Later, she was the cause behind Guðröðr's death as well, and had to escape back to her father. People afterwards called her Åsa Ill-ruler like her father Ingjald.
Ivar Vidfamne mustered a large army and besieged Ingjald and his daughter at Ræning, whereupon the two committed suicide by burning themselves to death inside the hall.
Read more about this topic: Halfdan The Valiant