Haakon Haraldsson (c. 920–961), also Haakon the Good (Old Norse: Hákon góði, Norwegian: Håkon den gode) and Haakon Adalsteinfostre (Old Norse: Hákon Aðalsteinsfóstri, Norwegian: Håkon Adalsteinsfostre), was the king of Norway from 934 to 961. He was noted for his attempts to introduce Christianity into Norway.