Who was the key person who spread Christianity in Norway?

The key person who spread Christianity in Norway was King Olav II Haraldsson, commonly known as St. Olav. He ruled from 1015 to 1028 and played a crucial role in consolidating the Christian faith in Norway, promoting its acceptance among the Scandinavian people. His efforts included the establishment of churches and the conversion of his subjects, which significantly shaped the religious landscape of Norway. After his death in battle, he was canonized, further solidifying his legacy as a key figure in the Christianization of the country.