Haakon I (hä`kən, Nor. hô`ko͝on) (Haakon the Good), c.915–961, king of Norway (c.935–961), son of Harold I. He was brought up as a Christian at the court of King Athelstan in England. His brother, Eric Bloodyaxe, had succeeded Harold as chief king, but the other sons of Harold refused to obey Eric and helped Haakon seize power. Haakon strengthened the national army and fleet. His effort to introduce Christianity was unsuccessful. He died from a battle wound, and Eric's sons succeeded him with Danish support.