Harald Bluetooth was a 10th-century monarch who ruled Denmark and held a tenuous hold over Norway. As the son of Gorm the Old and Thyra Dannebod, he consolidated power across much of Jutland and Zealand. He is most notably remembered for introducing Christianity to the Danish people and for his extensive infrastructure projects, including the construction of ring fortresses and major bridges. His reign ended when he was deposed by his son, Swein Forkbeard, leading to his death shortly thereafter.