sentences:  King Harald determined to remove his youngest son out of harm's way and accordingly sent him to the court of King Athelstan of England.Haakon was fostered by King Athelstan, as part of an agreement made by his father, for which reason Haakon was nicknamed "Adalsteinfostre".However, Haakon is not mentioned in any contemporary Anglo-Saxon sources, and later historians of Athelstan, such as William of Malmesbury, make no reference to Haakon.