Sigurd I Magnusson (c. 1090 – 26 March 1130), also known as Sigurd the Crusader (Old Norse: Sigurðr Jórsalafari, Norwegian: Sigurd Jorsalfar), was King of Norway from 1103 to 1130. His rule, together with his brother Eystein I of Norway (until Eystein died in 1123), has been regarded by historians as a golden age for the medieval Kingdom of Norway. He is otherwise famous for leading the Norwegian Crusade (1107–1110), earning the eponym "the Crusader".