The Monarchy of Denmark, colloquially known as the Danish Monarchy, is a constitutional institution and a historic office of the Kingdom of Denmark. The Kingdom includes not only Denmark, but the autonomous regions of Greenland and the Faroe Islands. The Kingdom of Denmark were already consolidated in the late 8th century, whose rulers are consistently referred to in Frankish sources as Kings (Reges). Under the rule of King Gudfred in 804 the Kingdom may have included all the major provinces of medieval DenmarkThe current unified kingdom of Denmark was founded by the Viking kings Gorm the Old and Harald Bluetooth in the 10th century, making the monarchy of Denmark the oldest in Europe. Originally an elective monarchy, it became hereditary only in the 17th century during the reign of Freder