Eystein II was a king of Norway who ruled during the early 12th century. He was part of the House of Knýtlinga and is known for his efforts to consolidate power in Norway. His reign was marked by conflicts with rival claimants to the throne, particularly Sigurd I and Olaf II. Eystein II's rule lasted from 1103 until his death in 1123. He is often remembered for his attempts to strengthen the monarchy and improve the administration of the kingdom. His legacy includes contributions to the development of Norway's political landscape during a time of significant change.