Niels, King of Denmark, ruled from 1104 to 1134. He was a member of the House of Knýtlinga and succeeded his brother, King Philip of Denmark. Niels is known for his efforts to strengthen the Danish monarchy and expand its influence in the region. During his reign, Niels faced challenges, including conflicts with the Danish nobility and rival claims to the throne. He is also remembered for his military campaigns against Sweden and Norway, which aimed to secure Denmark's borders and assert its power in Scandinavia.