Amalienborg and Marmor Kirke. The Amalienborg Castle in the front is the residence of the Danish royal family. Denmark's royal dynasty is said to be the oldest in Europe. The founding father, King Gorm den Gamle - the Old - lived around 940 AD. Another rather famous regent was Harald Blåtand - Harald Bluetooth - (about 950 AD). He unified Denmark and Norway. At this time the Danish Kings also ruled over parts of England. Family ties to all the local regents of the vast imperium made the Danish King Gorm to the Grand Old Man of the European royal families.