This episode illustrated graphically the odious trade in slaves which was centered on Dublin. Twelve ounces of silver for a man slave and 8 ounces for a woman!
Neil Oliver explained the trade route to Istanbul very well. I would point out though that while he was absolutely correct that in saying that most of the Vikings travelling east and down the rivers to Istanbul were from Sweden, Norwegians and Danes also made the journey. Indeed, in about 1032, Harold Sigurdsson, the Norwegian prince took over 300 warriors to Istanbul where they became members of the Varangian Guard.
The programme leader portrayed the mystical Birka Island beautifully, if any place is haunted, the fields there with almost 3000 graves and grave mounds most certainly is. (See Finn’s Fate page 169).