Harald Bluetooth (910?-987?) was the first Christian king of Denmark. He united Denmark under his rule in the mid-900’s.
Harald inherited the kingdom of Denmark from his father, Gorm the Old, in about 958. His base of power was at Jelling, near present-day Vejle. Harald continued his father’s efforts to expand the kingdom and to bring all of it more tightly under royal authority. Harald built many fortresses, roads, and bridges. He also defended Denmark from attacks by the Germans to the south. In about 960, Harold converted to Christianity. He encouraged the spread of Christianity in Denmark and built a number of churches.
In the late 950’s and the 960’s, Harald twice helped Norwegian rebels overthrow their king. Harald later claimed the title king of Norway, but he never controlled more than a small area in southeastern Norway.
In the mid-980’s, Harald’s son Sweyn rebelled against him. Harald was forced to flee Denmark and died in about 987. Sweyn, later known as Sweyn Forkbeard, became king.