Harald Fairhair was a Viking king who is often credited with uniting Norway into a single kingdom during the late 9th century. He is known for his military prowess and leadership, which helped him conquer various regions and tribes. His reign marked the beginning of a more centralized rule in Norway, setting the stage for future kings. Harald's legacy is significant in Scandinavian history, as he is considered the first King of Norway. His life and achievements are documented in various sagas, which are historical narratives that provide insight into Viking culture and society during that era.