The monarchy of Denmark is a constitutional institution and a historic office of the Kingdom of Denmark. The Kingdom includes Denmark proper and the autonomous territories of the Faroe Islands and Greenland. The Kingdom of Denmark was already consolidated in the 8th century, whose rulers are consistently referred to in Frankish sources as "kings". Under the rule of King Gudfred in 804 the Kingdom may have included all the major provinces of medieval Denmark.

Gorm the Old, also called Gorm the Languid, was ruler of Denmark, reigning from c. 936 to his death c. 958 or a few years later. He ruled from Jelling, and made the oldest of the Jelling stones in honour of his wife Thyra. Gorm was born before 900 and died perhaps around 958 or possibly 963 or 964.