Magnus IV was a king of Norway who reigned from 1130 to 1135. He was part of the House of Sverre and is known for his short and tumultuous rule during a period of civil war in Norway. His reign was marked by conflicts with rival factions, which were common in the struggle for power among Norwegian nobility. During his rule, Magnus IV faced challenges from other claimants to the throne, including Sigurd II. His reign ended when he was defeated and killed in battle, leading to the rise of other leaders in the ongoing power struggles of the time.