The Royal Norwegian Order of Saint Olav is the supreme Norwegian order, despite the fact that it was instituted in 1847 by the King of Sweden and Norway Oscar I. He became a Norwegian award after the dissolution of the Swedish-Norwegian Union in 1905. The King of Norway is the Grand Master of this order.
A curious fact: Order of St. Olav is mentioned in a book named "Kari" by the famous Norwegian children's writer Zinken Hopp (author of "The Magic Chalk", "Jon and Sophus" and others.).