King Valdemar II of Denmark, also known as Valdemar the Victorious, ruled from 1202 to 1241. He was a member of the House of Knýtlinga and is known for his military campaigns that expanded Danish territory. Valdemar II played a significant role in the Northern Crusades, aiming to spread Christianity in the Baltic region. During his reign, Valdemar II faced challenges, including conflicts with the Danish nobility and neighboring countries. His reign ended with his capture in 1223 during a battle against the Duchy of Schleswig. Despite his struggles, Valdemar II is remembered for his contributions to the development of Denmark as a unified kingdom.