St. Olav, also known as Olaf II of Norway, was a king who ruled from 1015 to 1030. He is best known for his efforts to convert Norway to Christianity and for unifying the country under a single monarchy. His reign marked significant changes in Norwegian society, including the establishment of churches and the promotion of Christian values. After his death in the Battle of Stiklestad in 1030, St. Olav was canonized as a saint by the Catholic Church. His legacy continues to be celebrated in Norway, particularly through the annual St. Olav Festival in Trondheim, which honors his contributions to the nation and its faith.