Ragnar's sons Eric and Agnar then sailed into Lake Mälaren and sent a message to the Swedish King Eysteinn, a vassal of Ragnar, that they wanted him to submit to Ragnar's sons. Moreover, Eric said that he wanted Eysteinn's daughter Borghild as wife. Eysteinn said that he first wanted to consult the Swedish chieftains. The chieftains said no to the offer, and ordered an attack on the rebellious sons. A battle ensued and Eric and Agnar were overwhelmed by the Swedish forces, whereupon Agnar died and Eric was taken prisoner. Eysteinn offered Eric as much of Uppsala öd as he wanted, and Borghild, in wergild for Agnar. Eric proclaimed that after such a defeat he wanted nothing but to choose the day of his own death. Eric asked to be impaled on spears that raised him above the dead and his wish was granted. In Zealand, Björn, Aslaug and Hvitserk, who had been playing tafl, became upset and sailed to Sweden with a large army. Aslaug rode with cavalry across the land. In a great battle they killed Eysteinn. According to the saga, their father Ragnar was captured and killed by King Ælla in England after a foolhardy invasion attempt. Björn and his brothers, seeking revenge, attacked Ælla but were beaten back. As Ivar realised that the English king could not be defeated right away, he sought reconciliation. He only asked for as much land as he could cover with an ox's hide and swore never to wage war against Ælla. Then Ivar cut the ox's hide into such fine strands that he could envelop a large fortress (in an older saga it was York and according to a younger saga it was London) which he could take as his own. Ivar made himself popular in England and asked his brothers to attack again. During the battle Ivar sided with his brothers and so did many of the English chieftains with their people, in loyalty to Ivar. Ælla was taken captive and in revenge they carved the blood eagle on him. Later Björn and his brothers pillaged in England, Normandy, France, and Lombardy, until they came to the town Luna in Italy. When they came back to Scandinavia, they divided the kingdom so that Björn Ironside took Uppsala and Sweden. Other sources The partly legendary Danish chronicle of Saxo Grammaticus, Gesta Danorum (c. 1200), is the first text to mention