Håkon IV, also known as Håkon Håkonsson, was the King of Norway from 1217 to 1263. He was born in 1204 and became king at a young age after a period of civil war in the country. Håkon is known for unifying Norway and strengthening its central authority, which helped to stabilize the kingdom. During his reign, Håkon IV expanded Norway's influence and established important trade relationships. He also supported the development of Norwegian law and culture, promoting the construction of churches and other public buildings. His leadership contributed to a period of relative peace and prosperity in Norway.