Saint Olaf was a Norwegian king and a martyr who was canonized as a saint in the Catholic Church. He is often referred to by several synonyms, including Olav Haraldsson, Saint Olav, and King Olaf II. His reign, which began in 1015, was marked by his efforts to Christianize Norway and unite the country under a single ruler. Today, Saint Olaf is celebrated as a symbol of Norway's Christian heritage and national identity. In addition, he is the patron saint of various churches and organizations, including the archdiocese of Trondheim and the Norwegian Armed Forces.