King Olav II, also known as Olav the Holy, was a king of Norway who reigned from 1015 to 1030. He is best known for his efforts to convert Norway to Christianity and for unifying the country under a single rule. His reign was marked by battles against local chieftains and the establishment of a more centralized government. After his death in the Battle of Stiklestad in 1030, Olav was canonized as a saint by the Catholic Church. His legacy is significant in Norwegian history, and he is celebrated as a national hero. His feast day is observed on July 29.