Harald Bluetooth's most important testimony comes from inscriptions found on a massive stone known as Jelling stone. According to local folklore, a stone initially discovered on the beach near the town of Vejle in Jutland was transported to Jelling on instructions from Harald Bluetooth, who later became famous as the Jelling stone. Harald's Bluetooth symbol and association with modern technology: Harald had Bluetooth as his nickname ("Blatand" in Danish), and two different reasons have been given for this. The first belief is that the old Viking king suffered from a bad tooth, which may have turned dark or blue in color.