Edmund Ætheling (/??dm?nd ?æ??l??/; c.?1015?17 ? possibly 1046, certainly by 1054) was a member of the royal House of Wessex as the son of Edmund Ironside, who briefly ruled as King of England between April and November 1016. After the Siege of London (October 1016), Edmund Ironside signed an agreement with Cnut the Great, in which they agreed that Cnut would rule England south of the Thames, whereas the rest, including London would remain among Ironside's possessions. In November 1016, Ironside died of unknown causes and Cnut became King of all England.
Intent on keeping his succession secure, Cnut sent Ironside's two infant sons, Edward and Edmund Ætheling, to his brother in Sweden, where they were to be murdered. Instead, the princes were spared and sent to safety to the Kingdom of Hungary, where they remained in the care of King Stephen I. After fleeing assassins hired by Cnut, the Æthelings arrived at the royal court of Kievan Rus' in 1028. The princes remained under the tutelage of Prince Yaroslav the Wise until adulthood. In 1046, the Æthelings both traveled to Hungary and helped the exiled Andrew of Hungary in his quest for the throne. Edmund died shortly after marrying a Hungarian princess, before 1054 (wikipedia.com)