Between the two mounds, close to the church, stand two rune stones. According to the inscription on the larger stone it was raised by Harald Bluetooth as a memorial to his parents, King Gorm and Queen Thyre. The inscription also proclaims that Harald joined Denmark under one king and made the Danes Christian. However, this monument to the Viking kings has not always looked the way its does today. It was constructed in several stages.
Excavations show that the site originally contained just a giant stone ship.
This formation extended a distance of 170 metres from the foot of a Bronze Age tumulus, which now forms the centre of the large north mound, to slightly south of the place where the south mound now stands. The smaller of the two rune stones may possibly, before being removed to its present position, have been part of this stone ship. It is probable that this large and majestic stone ship was built by King Gorm as a burial monument to his wife Thyre. The two rune stones fronting the church. Harald Bluetooth's Great Stone stands in its original position.