persuaded her husband to murder his brother, Halfdan III., king of Zealand. She then joined in a plot for the destruction of her husband; but this object was no sooner effected than she was obliged to flee for protection to the court of Upsal. Yet here she was not safe. Ivar Vidfadme, the son of Halfdan, in the resolution of avenging his father’s death, invaded Swionia, and wrapped it in blood and flames. When the news of this invasion reached Ingiald, he was at an entertainment, with his daughter and many nobles. He knew that he was hated; that resistance was impossible; that escape was hopeless; and by the advice of Asa he adopted an expedient which would, for ever, make his death as remarkable as his life. This was, to burn himself, his daughter, his guests, together with the house which contained them.[133] [Sidenote: 623 to 630.] By the death of Ingiald, his son, _Olaf Trætelia_, was the last of the Ynglings; but his claim to the throne, however sanctioned by custom or blood, was not likely to avail in opposition to so powerful an enemy as Ivar Vidfadme. At this moment, Ivar was at the head of the Danish, the Swedish, part of the Saxon and Anglian states (the Angles of Holstein); and his career was not to be resisted by a youth without army, without followers. Indeed, Olaf made no effort to resist; he saw that the people were resolved on the expulsion of the Ynglings; and, with the few friends who adhered to him, he hastened to the desert lands north and west of the Vener Lake. There he cleared off the forests,—hence his surname of Trætelia, or the Tree-feller,—drained them, and not only rendered them habitable, but in a short time made them the foundation of a new state, that of Vermeland. From him descended the famous Harald Harfager, monarch of Norway, the restorer of the ancient glory of the Ynglings.[134]