Many of us use Bluetooth technology every day, but know nothing or little of its namesake. And there is little to be known of the King of Denmark Harald “Bluetooth” Gormsson, except that he is credited with introducing Christianity to Denmark. In this episode, Søren Sindbæk explains what we do know of Bluetooth, and about his remarkable archaeological discovery of Danish Ring Forts. Søren is a Professor at the University of Aarhus.