Magnus I (1024 - October 25, 1047) was the King of Norway from 1035 to 1047 and the King of Denmark from 1042 to 1047. He was the illegitimate son of King Olaf II of Norway, by his concubine Alvhild. He is known by the cognomen, the Good or the Noble. St. Olav's direct line ceased its reign with the death of Magnus. It returned to the throne again in 1280, when Eric II, who through his mother descended from Magnus' legitimate sister, succeeded as king. Magnus' own daughter was in a marriage with a Norwegian nobleman, and the one descendant wed to the Earl of Orkney.