A runestone is typically a raised stone with a runic inscription, but the term can also be applied to inscriptions on boulders and on bedrock. The tradition began in the 4th century and lasted into the 12th century, but most of the runestones date from the late Viking Age. Most runestones are located in Scandinavia, but there are also scattered runestones in locations that were visited by Norsemen during the Viking Age. Runestones are often memorials to dead men. Runestones were usually brightly coloured when erected, though this is no longer evident as the colour has worn off. The vast majority of runestones are found in Sweden. The tradition of raising stones that had runic inscriptions first appeared in the 4th and 5th century, in Norway and Sweden, and these early runestones were usually placed next to graves. The earliest Danish runestones appeared in the 8th and 9th centuries, and there are about 50 runestones from the Migration Period in Scandinavia. Most runestones were erected during the period 950–1100 CE, and then they were mostly raised in Sweden, and to a lesser degree in Denmark and Norway. The tradition is mentioned in both Ynglinga saga and Hávamál: For men of consequence a mound should be raised to their memory, and for all other warriors who had been distinguished for manhood a standing stone, a custom that remained long after Odin's time. —The Ynglinga saga A son is better, though late he be born, And his father to death have fared; Memory-stones seldom stand by the road Save when kinsman honors his kin. What may have increased the spread of runestones was an event in Denmark in the 960s. King Harald Bluetooth had just been baptised and in order to mark the arrival of a new order and a new age, he commanded the construction of a runestone. The inscription reads King Haraldr ordered this monument made in memory of Gormr, his father, and in memory of Þyrvé, his mother; that Haraldr who won for himself all of Denmark and Norway and made the Danes Christian. The runestone has three sides of which two are decorated with images.