The New International Encyclopædia/Olaf I. Trygvasson
OLAF I., ō′lȧf, Trygvasson (?-1000). King of Norway from 995 to 1000. He was a descendant of Harald Haarfagr, and in his early years was one of the Vikings who terrorized the coasts of the North Sea, and made descents upon England, Ireland, and France. In 995 he seized the Government of Norway. He had previously been baptized, and he now exerted himself to introduce Christianity among his subjects. Some of the nobles, who refused to acknowledge Olaf's authority, stirred up the rulers of Denmark and Sweden to make war upon him, and he was defeated and slain in a great naval battle in 1000.