Answer
Harald Bluetooth, also known as Harald Bluetooth Gormsen or Harald I, was the King of Denmark from 958 to 986 and the King of Norway from 970 to 986, and is widely considered to be the first King of all Denmark and Norway. He was the son of Gorm the Old and Thyra Danebod, and the father of Sweyn Forkbeard, who succeeded him as King of Denmark.