Olav Haraldsson, also known as Saint Olaf, was a king of Norway who reigned from 1015 to 1028. He is best known for his efforts to convert Norway to Christianity and for unifying the country under his rule. His reign was marked by battles against rival factions and the establishment of a centralized government. After his death in the Battle of Stiklestad in 1030, Olav was canonized by the Catholic Church. His legacy as a saint and a national hero is celebrated in Norway, particularly during the feast day of Saint Olaf on July 29. His life and deeds are significant in Norwegian history and culture.