Ever wonder how Bluetooth technology got its name? Next time you pair an audiobook to your phone, tablet, or smart speaker, you can thank Harald “Bluetooth” Gormsson, Viking King of Denmark c. 958-986. Bluetooth was born into a new royal line centered at Jelling (North Jutland) and completed the country’s unification begun by his father. He converted the Danes to Christianity, and conquered Norway. Opinions on just why he was call Bluetooth range from his love of blueberries to having a ‘blue’ bad tooth to being a blue or dark thane (Blå-tand is Danish for Bluetooth). Regardless, if you think poor Harald had an unfortunate byname, consider those of his father Gorm ‘the Old’, and his son Sweyn I, ‘Forkbeard’!