Magnus I of Sweden

Magnus I, called the Strong (Magnus Nilsson, c. 1106–1134), was the son of Denmark's King Niels and Margaret, daughter of Sweden's Inge the Elder. After his cousin Inge the Younger died in the 1120s, he claimed Sweden through his mother and won recognition from the Geats after King Ragnvald Knaphövde was murdered.

In 1127 he married Richeza of Poland. In 1131 he had Canute Lavard killed, sparking civil war in Denmark, and he fell to Eric Emune at Fotevik on 4 June 1134.