Magnus I of Sweden (b. 1106)
Magnus the Strong (Swedish: Magnus Nilsson; Danish: Magnus Nielsen) (about 1106 – 4 June 1134 in the Battle of Fotevik) was a Danish duke who ruled Gothenland in southern Sweden from the 1120s to c. 1132. It is disputed whether he was elected king by the Swedes, but he is nevertheless sometimes found in the modern list of Swedish monarchs as Magnus I. Snorri Sturlason gives him the epithet Magnus the Strong.

He was also briefly co-king of Denmark from 15 April 1134 and until his death.