The Jelling Runic Stones are on Unesco's World Heritage List. The smallest one was erected by King Gorm the Old in memory of his wife, Thyra. This one, the biggest, is called Denmark's Certificate of Babtism and was erected by King Harald Bluetooth.
The inscription says "King Harald ordered this monument to be made in memory of Gorm, his father, and Thyra, his mother. The Harald who won all Denmark and Norway and christened the Danes." The last sentence is placed below the oldest picture of Christ in the Northern countries, hence the certificate of babtism.