Olaf I was a king of Norway who reigned from around 1028 to 1030. He is often referred to as Olaf Tryggvason, although he was not the same person as Olaf II, who is also known as Saint Olaf. Olaf I is known for his efforts to spread Christianity in Norway and for his attempts to unify the country under a single rule. During his reign, Olaf I faced challenges from rival factions and external threats, including invasions from Sweden and Denmark. His rule ended when he was defeated at the Battle of Stiklestad in 1030, leading to his eventual death. His legacy includes the promotion of Christianity and the establishment of a more centralized monarchy in Norway.