Danish Vikings were most active in what areas ?
The Slavs and the Byzantines also called them " Varangians " ( ON : " Væringjar " , meaning " sworn men " or from Slavic " варяги " supposedly deriving from the root " вар " — " profit " , as coming from the North they would profit by trading goods and not producing them , which had a negative connotation in Slavic culture of that time ) , and the Scandinavian bodyguards of the Byzantine emperors were known as the Varangian Guard .